Indolyl acids



United States Patent 3,316,267 INDQLYL ACIDS Tsung-Ying Sheri, Westtield, N..l., assignor to Merck dz C0., Inc., Rahway, N.J., a corporation of New Jersey 0 Drawing. Continuation of application Ser. No. 323,863, Nov. 4, 1963. This application Feb. 15, 1966, Ser. No. 528,020

3 Claims. (Cl. 260--250) This application is a continuation of my copending application, Ser. No. 323,863, filed Nov. 4, 1963, now abandoned, which was a divisional continuation-in-part of my copending application, Ser. No. 164,615, filed Jan. 5, 1962, now abandoned, which was a continuation-inpart of my application, Ser. No. 97,434, filed Mar. 22, 1961, now abandoned.

This invention relates to new chemical compounds. More particularly, it relates to a new class of compounds of the indole series. Still more particularly, it is concerned with new oc-(3-ind0lYDlOWEI' aliphatic acids having a diazine carboxylic acyl radical attached to the nitrogen atom of the indole ring. It is concerned further with salts, esters and amide derivatives of such compounds. It relates also to the synthesis of such substances.

The new aroyl heteroaroyl indolyl aliphatic acid compounds of this invention have the general structural formula:

1 s R- TCHF-C OM \N/-R2 R4 I i R1 in which R may be a pyrimidine, pyridazine, pyrazine or a substituted pyrimidine, pyridazine or pyrazine radical in which the substituents may be halogen, lower alkyl, lower alkylthio, lower alkoxy, trifluoromethyl, phenoxy, lower alkanoyl, carbamyl, benzylthio, nitro, mercapto, amino, di(lower alkyl) amino, lower alkanoylamino, hydroxy, benxyloxy, phenyl, carbamido, morpoholinomethyl, halogenophenyl, benzyl, lower alkoxyphenyl, lower alkylsulfonyl or hydroxyphenyl;

R may be hydrogen, lower alkenyl or lower alkyl;

R may be hydrogen or lower alkyl;

K, may be hydrogen, lower alkoxy,

or trifluoromethyl;

R may be hydrogen, lower alkyl lower alkoxy, nitro, amino, di(lower alkyl)amino, lower alkanoylamino, lower alkanoyl, bis(hydroxy lower alkyl)amino, 1- pyrrolidino, 4-methyl-1-piperizinyl, 4-morpholinyl, cyano, amino lower alkyl, di(lower alkyl)amino lower alkyl, trifluorornethyl, halogen, di(lower alkyl)sultarnyl, benzylthio, lower alkylbenzylthio, lower alkoxy benzylthio, halogenobenzylthio, benzyloxy, lower alkylbenzyloxy, lower alkoxybenzyloxy, halogenobenzyloxy, lower alkenyl, lower alkenyloxy, l-azacyclopropyl, cyclopropylmethyloxy or cyclobutylmethyloxy; and

M may be OH, NH lower alkoxy, benzyloxy, OZ where Z is a cation or OY where Y is the structure:

fluorine, lower alkyl In the most preferred compounds of the invention, R is a lower alkyl, lower alkoxy, nitro, amino, or substituted amino. Examples of the alkyl and alkoxys are methyl, ethyl, propyl, t-butyl, methoxy, ethoxy, i-propoxy and the like. R is not limited to this class of substituents such as hydrogen, aryl, aryloxy, hydroxy, mercapto, halo, pseudohalo such as 6P CHF or other haloalkyl, nitro, amino, alkylamino, acylamino, haloalkyl, cyano, sulfamyl, sulfoxide, aminomethyl, substituted aminomethyl, carboxy, carboalkoxy groups.

A critical feature of the new compounds described herein is the presence of a diazine carboxylic acyl radical attached to the N-l position of the indole. These acyl groups may be further substituted in the aromatic ring with hydrocarbon groups or with functional substituents. Thus, suitable acyl substituents are the pyrazinoyl, pyrimidine carboxy and pyridazine carboxy carboxylic groups. The aromatic rings of such groups may contain, and in the preferred compounds do contain, at least one functional substituent. This substituent may be a hydroxy or an etherified hydroxy (hydr-ocarbonoxy) group such as a lower alkoxy, e.g., methoxy, ethoxy, isopropoxy, propoxy, an alkenyloxy such as allyloxy, an aryloxy or aralkoxy group, e.g., phenoxy, benzyloxy, a hydroxyphenyl, p-methoxyphenyl and the like. It may be a nitro radical, a halogen such as chlorine, bromine, iodine or fluorine, an amino group or a substituted amino group, representative examples of which that might be mentioned are acylamino (benzylamino, lower alkanoylamino) amine oxide, ketimines, urethanes, lower alkylamino, lower dialkylamino, amidine, acylated amidines, hydrazine or a substituted hydrazine, alkoxyamines and sulfonated amines. Further, it may be a mercapto or a substituted mercapto radical of the type exemplified by alkylthio groups such as methylthio, ethylthio, and propylthio and arylthio or aralkylthio groups, e.g., benzylthio, phenylthio and lower alkylphenylthio. The N-1 aroyl radical may, if desired, be haloalkylated, as with a trifiuoromethyl, trifiuoroethyl, perfiuoroethyl, fi-chloroethyl or like substituent, acylated as with acetyl, propionyl, benzoyl and like acyl groups. In addition, the invention embraces compounds wherein the aroyl radical contains a cyano, or dialkylsulfonamido radical. Further, it may contain a carboxy substituent, or a derivative thereof, such as an alkali metal salt or a lower alkyl ester of the carboxy radical, an aldehyde, azide, amide, hydrazide and the like, or an aldehyde derivative of the type represented by acetals or thioacetals. In addition, it may be a carbamyl, carbamide, moropholinomethyl, phenyl, substituted phenyl, such as p-chlorophenyl, and p-methoxyphenyl, hydroxyphenyl or lower alkylsulfamyl. In the preferred compounds, the N-1 aroyl radical is S-pyrimidine carboxy and the func tional substituent is in the para position of the six-membered ring.

The, a-(3-indolyl)aliphatic acids described herein are preferably lower aliphatic acids such as a-3-indolyl) derivatives of acetic, propionic, butyric, valeric and like acids. Lower alkyl esters, salts and the amides of such aliphatic acids represent an additional aspect of the invention. The esters are important intermediates in the synthesis of the free acids, and in many cases are themselves of importance as end products. The preferred esters are the lower alkyl esters such as the methyl, ethyl propyl or t-butyl compounds and the benzyl, phalobenzyl and like esters.

The salts of these new a-(l-diazine carboxy-S-indolyl) lower aliphatic acids can be obtained by treatment of the free acid with base under mild conditions. In this manner there may he obtained alkaline metal salts such as the sodium and potassium, the aluminum or magnesium tlts or salts of alkaline earth metals, examples of which re barium and calcium. Salts of organic amines such dimethylamine, morpholine, methyl cyclohexylamine or lucosamine may be obtained by reacting the acid with 1e appropriate organic base. The amides included with- 1 this invention are conveniently synthesized by first reparing the amide of an a-(3-indolyl)lower aliphatic cid unsubstituted at the 1-position and then acylating aid compound by the process described hereinbelow. uch amides are conveniently obtained by reacting the ree acid with urea or treating the appropriate acid hloride with ammonia.

The 2-position of the indole ring nucleus (R in the tbove formula) may be hydrogen although it is preferred hat there be present at this position of the molecule a iydrocarbon radical having less than nine carbon atoms. Qower alkyl groups such as methyl, ethyl, propyl or uty1 are the most satisfactory, but lower alkenyl radi- :als also can be used.

The following compounds are representative of those :ontemplated by this invention and which may be prepared by the procedure discussed hereinbelow:

ethyl-a-[1-(6-chloro-3-py-ridizinyl carbonyl) Z-methyl- 5-rnethoxy-3-indolyl]propionate, benzyl-ot-[ l- S-pyrimidinyl carbonyl) Z-rnethyl-S-methoxy-3-indolyl1acetate, and the like.

The a-(l-diazine carboxy-3-indolyl)lower aliphatic acids and derivatives thereof described herein are synthesized by acylation of the a-(3-indolyl)lower aliphatic acid, ester or amide having the desired substituents at the 2- and 5- positions of the ring nucleus. It is preferred to carry out the acylation on an ester or amide derivative of the lower aliphatic acid. In those cases where the free acid is desired, the ester may be converted under suitable reaction conditions to the free acid. It has been observed that the l-acyl substituent is easily hydrolyzed under condition normally employed for saponification of an ester to the free acid. For this reason, care must be taken in converting the OL( lacyl-3-indolyl)lower aliphatic acid esters to the corresponding free acids. It has been found that one convenient method of accomplishing this conversion comprises acylation of the benzyl ester and subsequent hydrogenolytic removal of the benzyl ester. Alternatively, other esters such as the t-butyl esters, which are amenable to selective removal by other treatment, such as heating above 210 C. or by heating at 25l10 C. in the presence of a catalytic amount of an aryl sulfonic acid or other acids, may be utilized. When, instead of an ester, the amides of these acids are prepared, the free acids are formed by reaction of the amides with a stoichiometric quantity of nitrous acid in an inert solvent.

The acylation reaction is conducted by one of two methods. One such consists of treating the a-(3-indolyl)- lower aliphatic acid starting material with an alkali metal hydride such as sodium hydride to form, e.g., a sodium salt and then intimately contacting said salt with the diazine carboxylic acid halide in an anhydrous solvent medium. It is preferred to employ solvents such as dimethylformamide, dimethylformamide-benzene, benzene, toluene or Xylene. It is preferred to carry out the acylation at about room temperature although lower r preferred to form 4. temperatures may be employed if the particular reactants are unduly susceptible to decomposition.

An alternative and (with these basic heteroaroyl acids) greatly preferred method of acrylating the l-position is by use of a phenolic ester of the acylating acid, such as the p-nitrophenyl ester. This latter is prepared by mixing the acid and p-nitrophenol in tetrahydrofuran and adding dicyclohexyl carbodiimide in tetrahydrofurane slowly. The dicyclohexylurea which forms is removed by filtration and the nitrophenylester is recovered from the filtrate. Alternatively, there can also be used the anhydride, azide or thiophenolic ester of the acylating acid. Whichever is used, the acylation of the pt-(3-ll'ldolyl)lower aliphatic acid starting material is achieved by forming a sodium salt of said material with sodium hydride in an anhydrous solvent and adding the nitrophenylester. Because of the basic character of these aroyl acids, this method is preferred over the acid chloride: method for diazine carboxy indoles.

The a-(l,3-indolyl)lower aliphatic acid compounds of this invention have a high degree of anti-inflammatory activity and are effective in the prevention and inhibition of granuloma tissue formation. Certain of them possess this activity in high degree and are of value in the treatment of arthritic and dematological disorders and in like conditions which are responsive to treatment with antiinflammatory agents. In addition, the compounds of this invention have a useful degree of antipyretic activity. For these purposes, they are normally administered orally in tablets or capsules, the optimum dosage depending, of course, on the particular compound being used and the type and severity of infection being treated. Although the optimum quantities of these compounds of this invention to be used in such manner will depend on the compound employed and the particular type of disease condition treated, oral dose levels of preferred compounds in the range of 10-2000 mg. per day are useful in control of arthritic conditions, depending on the activity of the specific compound and the reaction sensitivity of the patient.

The indolyl aliphatic acid compounds employed as starting material in the reaction discussed above, and having the formula:

where R R R and R have the previously defined meanings and E is a hydrocarbonoxy radical having less than nine carbon atoms or NH may be synthesized in various ways. When R is hydrogen or methyl, it is such compounds by reacting together an appropriately substituted phenylhydrazine and a substituted levulinic ester amide to form an intermediate phenylhydrazone which cyclizes under the reaction conditions to the indole compound:

where R R R and E are as above, and R is hydrogen or methyl. The reaction is normally carried out in a lower alkanol such as methanol, ethanol, isopropanol or butanol containing an acid such as hydrochloric, hy-

drobromic, sulfuric or acetic acid or in aqueous mineral acid such as concentrated hydrochloric, hydrobromic, sulfuric or acetic acid, or other Lewis acids such as ZnCI BF SnCl, and the like. The acid serves as a catalyst in the condensation and ring closure reactions leading to the l-unsubstituted indole. When the substituted levulinic esters are used, the nature of the ester is not critical, although it is preferred to utilize a lower alkyl ester, e.g., the methyl, ethyl, propyl, isobutyl or isopropyl compound. To avoid the possibility of transesterification the alcohol used as the solvent medium is preferably the same as the alcohol moiety of the ester. When R is hydrogen, it is convenient to employ the aldehyde in the form of an acetal, e.g., methyl 'y,'y-dimethoxybutyrate. An acid addition salt of the phenylhydrazine reactant, for example, the hydrochloride, is normally preferred over the free base for practical reasons, although such salts and the base are equivalent in the reaction itself. Formation of the ot-(3-indolyl) aliphatic acid, or ester thereof, is brought about at elevated temperatures, good results being obtained by refluxing the reaction mixture for at least about minutes. Longer reaction times are not harmful and may be used if desired. The desired compound is recovered from the reaction mixture and purified by techniques such as solvent extraction, chromatography and/or distillation. Since the 1-unsubstituted esters are low melting solids, they are conveniently purified by distillation under reduced pressure. They are saponified by treatment with an alkali metal hydroxide. The substituted phenylhydrazines employed as one of the starting materials in this synthesis are prepared by known methods. One convenient method is by diazotization of the appropriately substituted aniline to give the diazo compound, treatment of the latter with stannous chloride to form a tin complex, and decomposition of this complex to the phenylhydrazine with sodium hydroxide. The l-acyl group in a-(1-acyl-3-indolyl)aliphatic acids and esters of this invention is, as has been mentioned earlier, easily hydrolyzed under the conditions normally used to saponify an ester. For this reason, the benzyl ester of the intermediate a-(l-unsubstituted-3-indo1y1)- acids are a convenient starting material. These are obtained by forming the free a-(l-unsubstituted-3-indolyl)- aliphatic acid and estcrifying this with benzyl alcohol in an inert solvent with an acid catalyst (sulfuric, aryl sulfonic acids, etc.). Alternatively, the intermediate benzyl ester is synthesized directly by using the benzyl ester of the proper levulinic acid in the original synthesis of the indole ring, or is formed by base catalyzed ester exchange from other esters. After acylation of the indole nitrogen of these benzyl ester intermediates, the benzyl group can be removed clearly by hydrogenolysis, a process which leaves the l-acyl group untouched.

Alternatively, it is possible first to produce an indole of the formula:

where R R and R have the same meaning as before, and then to introduce the carboxylic acid residue at the 3-position. This is accomplished by treating the indole of the above formula under Mannich reaction conditions with formaldehydedialkylamine to produce a substituted gramine, subsequently reacting this latter compoundwith an alkali metal cyanide in a lower alkanol, and finally hydrolyzing with a strong base such as sodium or potassi-um hydroxide.

While this method of introducing the aliphatic acid residue at the 3-position after elaboration of the indole ring is, of course, generally applicable to compounds having the structure shown above, it is particularly useful for making compounds of this invention wherein R is an alkyl radical other than methyl, such a sthe 2-ethyl, 2- propyl, 2-allyl and like substances. Compounds of the above formula, unsubstituted in the 3-position, are readily prepared following the procedures set forth in columns 2 and 3 of US. Patent No. 2,825,734. Products where R is acyloxy, halo, cyano, carboxy, carbalkoxy, alkyl, aryl, aralkyl, nitro or hydrocarbonoxy are prepared via the synthesis beginning from a substituted 2-nitro benzaldehyde or Z-nitrotoluene.

The synthesis of various compounds of this invention having on the indole ring system a S-substitutent which has a nitrogen attached to the homocyclic ring of the indole is generally based on the S-nitro compound. This is transformed into the desired S-Substituent. Such transformation may be before or after acylation of the l-position, depending on the extent to which the desired 5- substituent may interfere with the acylation. If such interference is possible, the l-acylation should be carried out on the 5-nitro indole and the nitro later transformed into the desired S-Substituent. Such transformation can be carried out in a number of Ways. Reduction of the S-nitro groups gives a S-amino group. Reaction of the amino with alkyl halides gives mono and dialkyl amino groups. If the alkyl halide is a dihaloalkylene group (e.g., 1,4-dibromobutane) a heterocyclic ring (e.g., pyrrolidino) is formed. Similarly, bistfl-chlorethynether will give an N-morpholino compound. Alkylation can also be carried out simultaneous with reduction as, e.g., with formaldehyde and Raney nickel and hydrogen. Acylation can similarly be carried out on the S-amino compounds or on the 5-nitro (with simultaneous reduction) to give S-acylamido compounds. The S-amino group can be reacted with isocyanates to give S-ureido compounds,

This application is a divisional continuation-in-part of my copending application, Ser. No. 164,615, filed Jan. 5, 1962, which was a continuation-in-part of my application, Ser. No. 97,434, filed Mar. 22, 1961, now abandoned.

EXAMPLE 1 (A) Ethyl 0t (2 methyl 5 methoxy 3 indolyl) pr0pionate.-A solution of 25 g. of p-methoxyphenylhydrazine hydrochloride and 20 g. of ethyl tx-methyl levulimate in 250 ml. of 2 N ethanolic hydrochloride is heated on a steam bath for a few minutes. An exothermic reaction takes place with the separation of ammonium chloride. The reaction flask is removed from the steam bath and the mixture allowed to reflux gently until the initial reaction subsides. The mixture is again heated on a steam bath under reflux for 30 minutes, and then concentrated in vacuo to a volume of about ml. The concentrate is diluted with about 400 ml. of water and extracted with ether. The resulting ethereal extract .is washed with a saturated solution of sodium bicarbonate, and with water, and dried over anhydrous sodium sulfate. The dried solution is filtered and evaporated to a dark brown syrup which is purified by chromatography over about 1 lb. of acid-washed alumina. in a 2%" ID. column using mixtures of ether and petroleum ether (v./v. 1:9 to 1:1) as eluent. The light yellow syrup so obtained is distilled in a short-path distillation apparatus and the product collected at B.P. l50-153 C. (0.25 mm). The distillate of ethyle-(Z-methyl-Smethoxy- 3-indolyl)propionate crystallizes on trituration with petroleum ether, M.P. 53-555 C. On recrystallization from a mixture of ether and petroleum ether the melting point is unchanged.

Cale-d. for C H O N: C, 68.94; Found: C, 69.23; H, 7.31; N, 5.60.

When the methyl, propyl, isopropyl or benzyl ester of ct-methyl levulinic acid is employed in the above reaction in place of the ethyl ester, there is obtained methyLa-(Z- methyl 5 methoxy 3 indolyl) propionate, propyl 0c 7 '.-methyl-5-met-hoxy-3-indolyl) propionate, isopropyl-al-methyl--methoxy-3-indolyl) propionate, or benzyl-otl-methyl-S-methoxy-B-indolyl) propionate, respectively. lternatively, when an ester of levulinic acid is used as arting material in the above process, the corresponding ;ter of a-(2-methyl-5-methoxy-3-indolyl)acetic acid is btained.

(B) Ethyl-ot-(LJ dimetlzyl-S-indolyl)pr0pi0nate.-20 of p-methylphenylhydrazine hydrochloride and g. of thyl a-methyl levulinate are added to 250 ml. of 2 N thanolic hydrogen chloride and the mixture warmed until eaction sets in. After the initial exothermic reaction tops, the mixture is refluxed for about /2 hour and then :oncentrated in vacuo to about /3 volume. 400 ml. of vater are added and the aqueous solution extracted with :ther. The ether extracts are washed with sodium bicaronate solution, and with water, then dried over sodium ;ulfate. The ether solution is concentrated to a small lolume in vacuo and chromatographed over acid-washed alumnina (1 lb. of alumina in a 2% ID. column). The material eluted with ether-petroleum ether (v./v. 9:1 to 1:1) is distilled in a short-path distillation apparatus. Ethyl-a (2,5 dimethyl 3 indolyl)propionate distills at l-l70 (bath temp.)/1 mm., and crystallizes on trituration with petroleum ether, MP. 8-885" C.

When. a lower alkyl or benyl lcvulinate is employed in place of ethyl a-methyl levulinate, lower alkyl or benzyl- (2,5-dimethyl-3-indolyl)acetate is produced.

EXAMPLE 2 EthyI-a-(I-S-pyrimidinyZ carbonyl-Z-methyl-S-methoxy- S-indolyl propionate A suspension of 2.3 g. (0.046 m.) of 50% sodium hydride-mineral oil in 250 ml. of dimethylformamide is stirred for 20 minutes under nitrogen with ice-cooling. Then 8.64 g. (0.035 m.) of ethyl-a-(Z-methyl-S-methoxy- 3-indolyl)propionate is added and the mixture stirred for 20 minutes. 0.046 m. of S-pyrimidinyl carbonyl chloride in 50 ml. of dimethylformamide is added dropwise over a period of 30 minutes. The mixture is stirred in an icebath for 5 hours under nitrogen. lt is then poured into a mixture of 500 ml. of ether, 5 ml. of acetic acid and 1.1 of iced water. The organic products are extracted with 3x300 ml. of ether. The ether solutions are combined and washed with a large quantity of water, and dried over sodium sulfate. The solution is filtered, evaporated to near dryness and the residue charged onto a 300 g. alumina column. The ethyl-ot-(5-pyrimidinyl carbonyl-Z-methyl-S methoxy 3 indolyl)proprionate is eluted with 20-50% ether in petroleum ether. It is obtained on concentration of the eluates to dryness.

The S-pyrimidinyl carboxy chloride starting material is obtained by heating a mixture of 0.15 m. of S-pyrimidine carboxylic acid and 0.18 m. of thionyl chloride on a steam bath for one hour. About 20 ml. of benzene is then added and boiled off. The remaining mixture is diluted with petroleum ether. On cooling, the acid chloride hydrochloride separated.

When methyl-(Z-methyl-5-methoxy-3-indolyl) acetate is employed as the starting material in the above process, there is obtained methyl (5 pyrimidinyl carbonyl 2 methyl-5 -methoxy-3 -indolyl) acetate.

When pyridazinyl3-carboxy chloride and pyrazinoyl chloride is used in the above procedure in place of 5- pyrimidinyl carboxy chloride, there are obtained ethyl-a- [1-(3-pyridaziny-l carbonyl-Z-methyl-S methoxy-3-indolyl)] propionate and ethyl-a-(l-pyr-azinoyl-Z-methyl-S- methoxy-3-indolyl)-5-pyrimidinoyl carboxy.

EXAMPLE 3 Methyl- [1-(5-pyrimidinyl carbonyl) -2-methyl-5-meth0xy- 3-irzd0lyl] acetate (A) p-Nitrophenyl-ipyrimidine carb0xyIate.--In a 500 ml. round bottom flask (all equipment flame dried) is added 13.9 g. of p-nitrophenol and 5.3 g. S-pyri'midine carboxylic acid in 250 ml. dry tetrahydrofuran. Through a dropping funnel is added over 30 minutes 20.6 g. of dicyclohexylcarbodimide in ml. of dry tetrahydrofuran. The reaction is allowed to run overnight with stirring. The dicyclohexylurea which forms during the reaction is filtered. The filter cake is Washed with dry tetrahydrofuran. The solution is evaporated to dryness. The solid is taken up in benzene and washed with sodium bicarbonate solution and then with water and dried over anhydrous sodium sulfate. The solution is concentrated under vacuum to dryness. The solid p-nitrophenyl-S- pyrimidinylcarboxylate is then recrystallized from benzene.

(B) Methyl 1 (5 pyrimidinyl carbonyl 2 methyl- S-merhoxy-S-indolyl)acetatet.-ln a 250 ml. .round bottom flask (flame dried equipment) is placed at 0 C. with nitrogen, 100 ml. of dry dimethylformamide with 10.5 g. of methyl-a-(2-methyl-5-methoxy-3-ind0lyl)acetate. To this is added 2.5 g. of 50% sodium hydride mineral oil mixture. After the mixture is stirred for 30 minutes there is added over 15 minutes a solution of 6.7 g. of p-nitrophenyl-5-pyrimidinyl carboxylate in 50 ml. dry dimethylformamide. The reaction mixture is stirred for 4 hours at 0 C. under nitrogen followed by stirring under nitrogen at room temperature overnight. The reaction mixture is then poured into an ice-water-ether solution containing a few ml. of acetic acid and the layer are separated. The aqueous phase is washed with ether and the ether extracts are combined and dried over sodium sulfate. To the ether solution is added a saturated solution of hydrogen chloride gas in dry ether. The ether is decanted off, leaving a heavy oil. The oil is washed with ether followed by an addition of aqueous sodium bicarbonate solution. The product is then extracted with ether. The ether layer is dried over anhydrous sodium sulfate and concentrated to dryness. The product, methyl [1 (5 pyrimidinyl carbonyl) 2 methyl 5 methoxy-3-indolyl] acetate is crystallized from benzene- Skellysolve B.

EXAMPLE 4 Methyl [1 -(4,S-diehloropyrimidinyZ-S-carbonyl) Z-methyl-5-meth0xy-3-ind0lyl] acetate The procedure of Example 3 is followed using 5-(4,5- dichloropyrimidine) carboxylic acid in place of S-pyrimidine carboxylic acid in part A and the product thereof in the procedure of part B, to yield methyl l-(4,5-dichloropyrimidinyl 5 carbonyl) Z-methyl 5 methoxy 3- indolyl acetate.

Similarly, when 6-acetamido-pyrazinoic acid, 3-bromopyrazinoic acid, 6-methylpyrazinoic acid, 3-carbamylpyrazinoic acid, 3-chloropyrazinoic acid, 3-benzamidopyrazinoic acid, 2,6-dichloro pyrimidine-4-carboxylic acid, 5-bromo-2-methylpyrimidinel-carboxylic acid, 2-methyl-5-phenylpyrimidine-4-carboxylic acid, 2-methylthiopyrimidine-4-carboxylic acid, 2,6dieth0xypyrimidine-4-carboxylic acid, 5-bromo-2-methylthiopyrimidine-4-carboxylic acid, 2,6-bis (methylthio pyrimidine-4-carboxylic acid, 7 4-chloro-Z-trifluoromethyl pyrimidine-S-carboxylic acid, Z-ethylsulfamyl-S-carboxylic acid, 4,5-dichloropyrimidiue-S-carboxylic acid, 2,4-dimethoxypyrimidine-5-carboxylic acid, Z-benzylmercapto-4-chloropyrimidine-S-carboxylic acid, 4-chlor0-2-ethylmercaptopyrimidine-S-carboxylic acid, 4-phenoxy-2-trifiuoromethylpyrimidine-S-carboxylic acid, 4-mogpholinomethyl-2-phenylpyrimidine-Smarboxylic aci are used instead of pyrimidine-S-carboxylic acid in the procedure of Example 3, the corresponding methyl-1- acyl-2-methyl-5-methoxy-3-indolylacetates are obtained.

EXAMPLE '5 Lpyrazinoyl-Z-methyl-5-methoxy-3-indoly[acetic acid (A) 2-methyl-5-methoxy-S-indolylacetic anhydride. Dicyclohexylcarbodiimide (10 g., 0.049 mole) is dissolved in a solution of 2-methyl-5-methoxy-3-indolyl acetic acid (22 g, 0.10 mole) in 200 ml. of TH and the solution is allowed to stand at room temperature for two hours. The precipitated urea is removed by filtration, and the filtrate is evaporated in vacuo to a residue and flushed with Skellysolve B. The residual oily anhydride is used without purification in the next step.

(B) t Butyl 2 methyl 5 mcthoxy 3 indolylacetate.t-Butyl alcohol (25 ml.) and fused zinc chloride (0.3 g.) are added to the anhydride from part A. The solution is refluxed for 16 hours and excess alcohol is removed in vacuo. The residue is dissolved in ether, washed several times with saturated bicarbonate, water and saturated salt solution. After drying over magnesium sulfate, the solution is treated with charcoal, evaporated, and flushed several times with Skellysolve B for complete removal of alcohol. The residual oily ester (18 g., 93%) is used without purification.

(C) t Butyl 1 pyrazz'noyl 2 methyl 5 methoxy- 3-indolylacetaie.--A stirred solution of ester (18 g., 0.065 mole) in dry dimethylformamide (450 ml.) is cooled to 4 in an ice-bath, and sodium hydride (4.9 g., 0.098 mole, 50% susp.) is added in portions. After 15 minutes, p-nitrophenyl pyrazinoate (prepared by the procedure of Example 3A using pyrazinoic acid instead of pyrimidino- 5carboxylic acid (0.085 mole) in dimethylformamide is added dropwise during 10 minutes, and the mixture is stirred for four hours at C. under nitrogen followed by overnight at room temperature. The mixture is then poured into an ice water ether mixture containing a few ml. of acetic acid. The layers are separated and the aqueous phase is extracted with ether. The ether solutions are combined, dried over sodium sulfate and to the solution is added a saturated solution of and the extract is aqueous solution is filtered with suction to remove ether, neutralized with acetic acid, and diluted with ethanol to precipitate the zwitter ion. The crude product, l-pyraziuoyl-2methyl-5-methoxy-3-indolylacetic acid is recrystallized from aqueous ethanol and dried in vacuo.

EXAMPLE 6 Ethyl 0H (1-pyridazinyl-3-carbonyl-2-methyl-5- meth0xy-3ind0lyl) propionate The procedure of Example 3A is followed, using pyridazine-3-carboxylic acid instead of pyrimidine-carboxylic acid to produce p-nitrophenyl pyridazine-3-carboxylate. This is then used in the procedure of Example 3B, using ethyl a-(Z-methyl-S-methoxy-B-indolyl)propionate instead of methyl 2methyl-5-methoxy-3-indolylacetate, to produce ethyl ot-(Lpyridazinyl-3-carbonyl-2- methyl-S-meth oxy-3 -indolyl) propion ate.

EXAMPLE 7 1 -(2,d-diethoxypyrimidinyl-4-carb0nyl-Z-methy1-5- methoxy-S-indolylacetic acid (A) A solution of 15 g. of methyl-(Z-methyl-S- methoxy-3-indolyl)acetate and 0.2 g. of sodium in 60 ml. of benzyl alcohol is slowly fractionated over a period of 4 hours through a Vigreux column to remove methanol. The excess benzyl alcohol is then removed by distillation at 60 C. (2.5 mm.) to give a residue of 18.6 g. of benzyl-(2-methyl-5-methoxy-3-indolyl)acetate.

(B) 10 g. of the benzyl ester obtained above is added to 6.6 g. of 51% sodium hydride-mineral oil emulsion in 260 ml. of dimethylformamide according to the procedure of Example 2. This mixture is treated as described in that example with 2,6-diethoxypyrirnidinyl-4-carboxy chloride (prepared by heating the free acid with excess SOCI followed by removal of excess thionyl chloride in vacuo) and the reaction mixture worked up by the above described process using a chromatographic column of 340 g. of alumina and eluting With 2030% ether in petroleum ether. From these eluates there is dbtained benzyl- 1- (2, 6-diethoxypyrimidinyl-4carbonyl) -2-methyl- S-methoxy-S-indolylJacetate.

(C) 1.5 g. of the ester obtained in part B above is added to 20 ml. of ethyl acetate containing a drop of acetic acid and reduced catalytically at room temperature in the presence of palladium on charcoal catalyst. When the reduction is complete the catalyst is removed by filtration and the filtrate evaporated to a crystalline residue. This residue is recrystallized from aqueous ethanol to give 1-(2,6-diethoxypyrimidinyl-4-carbonyl)2- methyl-5-methoxy-3-indolylacetic acid.

EXAMPLE 8 1- (pyridazinyl- -carbonyl) -2-methyl-5-methoxy- 3-ind0lylacetic acid EXAMPLE 9 1 pyrimidinyl-5 -carb any! -2-mezhy 1-5 -meth0xy- 3-indolyZ-a-propionic acid (A) Z-methyl-S-melhoxy 3-ind0lyl-ot-pr0pi0nic anlzya'ride.-Dicyclohexylcarbodiimide (9 g. 0.044 mole) is dissolved in a solution of 2-methyl-5-methoxy-3-indolyla-propionic acid (211 g., 0.09 mole) and 200 m1. of THF, and the solution is allowed to stand at room temperature for two hours. The precipitated urea is removed by filtration, and the filtrate is evaporated in vacuo to a residue and flushed with Skellysolve B. The residual oily anhydride is used without purification.

(B) t-Butyl-Z-methyl 5 methoxy-3i/td0lyl-a-pr0pi0- rzale.-t-Butyl alcohol (25 ml.) and fused zinc chloride (0.3 g.) are added to the above anhydride. The solution is refluxed for 16 hours, and excess alcohol is removed in vacuo. The residue is dissolved in ether, washed several times with saturated bicarbonate, water and saturated salt solution. After drying over magnesium sulfate the solution is treated with charcoal, evaporated, and flushed several times with Skellysolve B for complete removal of alcohol. The residual oil ester ('14 g.) is used without purification.

(C) t-Butyl-l-(pyrimidinyl 5 carbonyl-Z-methyl-S- meth0xy-3-ind0lyl-ot'propioizate A stirred solution of aster from part B (20 g., 0.69 mole) in 450 ml. of dry dinethylformamide is cooled to 4 in an ice bath and sodilm hydride (5.2 g., 0.10 mole, 50% susp.) is added in portions. After the mixture is stirred for 10 minutes, a DMF solution of pyrimidinyl-S-carboxy chloride (0.091 mole) (prepared by heating the free acid with SOC1 followed by evaporation in vacuo is added in portions during 10 minutes, and the mixture is stirred for 7 hours at room temperature without replenishing the ice bath. The mixture is then poured into one liter of 1% acetic acid, extracted with ether, washed thoroughly with water, bicarbonate, saturated salt solution, dried over mangesium sulfate, treated with charcoal, and evaporated in vacuo to a residue. This is dissolved in ether, mixed with 100 g. of neutral alumina, and evaporated in vacuo to dryness. The residue is placed above a column of 300 g. of neutral alumina in Skellysolve B. After washing with Skellysolve B, the product is eluted with 25% ether-Skellysolve B (D) 1 (pyrimidinyl 5 carbonyl) 2 methyl 5- methxy-3-ind0lyl-m-propionic acid. -The pyrolysis is carried out in the same manner as with t-butyl 1- pyraziuoly-Z-methyl--methoxy-3-indolyl acetate (of Example 5D). The product is recrystallized from aqueous ethanol or benezene-Skellysolve.

Example Methyl (Z-methyl-5-nitr0-3-indolyl)acetate A solution of 40 g. of levulinic acid in 300 ml. of hot water is added to a solution of 65 g. of p-nitrophenylhydrazine hydrochloride in 700 ml. of hot water with stirring. After one-half hour, the hydrazone derivative is collected in -a filter, washer with water and dried at 110 in vacuo. The yield is 84 g., M.P. 175179.

An amount of 42 g. of the above hydrazone is added to a solution of 120 g. of fused zinc chloride in 100 ml. of absolute ethanol and the mixture is refluxed for 18 hours. The cooled solution is poured into dilute hydrochloric acid with stirring, and the insoluable gummy material separated is extracted With hot ethanol. The ethanolic extract is evaporated in vacuo to a syrup, which is redissolved in ether. The ether solution is extracted with 10% sodium carbonate several times. Acidification of the aqueous solution gives a crude product which recrystallizes from chloroform to give (2-methyl-5- nitro-3-indolyl)acetic acid, MP. 238.

The above acid is treated with a mixture of 3 g. of sulfuric acid and 40 ml. of methanol at the reflux temperature for 6 hours. The methyl ester is obtained as a yellow crystalline product, MP. 132-40 after recrystallization from benzene.

Similarly, methyl-ot-(2-methyl-5-nitro-3-indolyl)propionate is prepared by using an equivalent amount of a-methyl levulinic acid as the starting material.

EXAMPLE 11 Methyl (Z-methyl-5-amino-3-ind0lyl)acetate '3 g. of methyl(2-methyl-5-nitro-3-indolyl) acetate is dissolved in 300 ml. dry methanol and reduced in hydrogen in an autoclave with Raney nickel as catalyst. After the theoretical amount of hydrogen is taken up the catalyst is removed by filtration. The catalyst and reaction flask are washed with methanol. The methanol solution is evaporated to dryness. The product is crystallized from benzene, MP. 144-145.

Micr0analysis.-Calcd.: C, 66.03; H, 6.47; N, 12.84. Found: C, 65.96; H, 6.29; N. 12.56.

EXAMPLE 12 Methyl[2 methyl 5 (l'pyrrolidino) 3 idolyl1acetate In a 125 ml. flask is placed 80 ml. of ethanol. To this ls added 1.0 g. of methyl (2methyl-5-amino-3-indolyl) acetate, 0.99 g. of 1,4-dibromobutane and 0.975 g. of anhydrous sodium carbonate. This mixture is stirred at reflux temperature in a nitrogen atmosphere for 6 hours. The reaction mixture is then filtered and the filtrate is concentrated in vacuo to a small volume and diluted with ether. This solution is then washed with water 2X, dried with anhydrous sodium sulfate and concentrated in vacuo to dryness. The product is absorbed on 6 g. of silica gel. The product is then chromatographed over 30 g. of silica gel using as elutant from v./v. 3:1 etherpetroleum ether to ether. The eluted material is combined and crystallized from benzeneSkellysolve B. M.P. 117118.

Micr0analysis.-Calcd.: C, 70.56; H, 7.40; N. 10.29. Found: C, 70.77; H, 7.72; N, 10.00.

When ethylene dibromide is used instead of dibromobutane, the product obtained is the 5-(1-azacyclopropyl) indolyl compound.

EXAMPLE 13 ethyl-[1 (pyrimidz'nyl 5 carbonyl) 2 methyl 5 (1-pyrr0lidin0)-3-ind0lyl1acetate H nitro-3-indolyl1acetate.

EXAMPLE 14 Methyl[1-(1 pyrimidinyl 4 carbonyl)-2-methyl-5- nitr0-3-ind0lyl1actate In a dried 250 ml. flask is placed 3.9 g. of methyl(2 methyl-5-nitro-3-indolyl)acetate in ml. dry dimethylformamide. To this solution cooled to 0 C. is added 0.8 g. of 50% sodium hydride-mineral oil. This is stirred under nitrogen for 30 minutes. To this is added drop- Wise 4.0 g. of p-nitrophenyl pyrimidine-4-carboxylate (prepared as in Example 3A) in 15 ml. of dry dimethylformamide over a 5-minute period. The reaction mixture is stirred 4 hours at 0 C. under nitrogen and then stirred overnight at room temperature under nitrogen. It is then poured into an ice water-ether solution containing a feW milliliters of acetic acid. The ether layer is separated and the aqueous layer is washed with ether. To the combined ether layers after drying over Na SO is added a saturated solution of hydrogen chloride gas in dry ether. The ether layer is decanted and the residue is washed with ether followed by an addition of aqueous NaHCO solution. The alkaline solution is then extracted with ether and the ether layer is dried and evaporated in vacuo. The product, methyl[1-(pyrimidinyl 4-carbonyl) -2-methyl-5- nitro-3-indolyl1acetate is crystallized from dry ether- Skellysolve.

EXAMPLE 15 Methyl [1 -(5-pyrimidinyl carbonyl)-2-m ethyl- S-dimethylamin0-3-ind0lyl] acetate EXAMPLE 16 Methyl[1-(5-pyrimidinyl carb0nyl)-2-methyl 5-acetamin0-3-indolyl]acetate To 0.388 g. of methyl[1-(5-pyrimidinyl carbonyl) 5-nitro-3-indolyl]acetate in 30 ml. of anhydrous ethyl acetate is added 0.306 g. acetic. anhydride. The mixture is reduced with Raney nickel at room temperature and 40 psi. After the theoretical amount of hydrogen has been absorbed, the catalyst is removed by filtration. The solution is concentrated in vacuo to a small volume and poured into an ice water-ether mixture. The ether layer is separated and the aqueous layer is Washed with ether. The combined ether extracts are washed with sodium bicarbonate followed by water, dried with anhydrous sodium sulfate and concentrated in vacuo to dryness. The product, methyl l-(S-pyrimidinyl carbonyl)-2-methyl 5- acetamino-3-indolyl]acetate, is crystallized from benzene and ether.

EXAMPLE 17 Benzy l-(2-methyl-5-nitr0-3-ind0lyl) acetate In adry 250 ml. flask is placed 80 ml. dry benzene and 20 ml. benzyl alcohol. To this is added 3.0 g. of 2methyl-5-nitro-3-indolylacetic acid and 0.2 g. of p-toluenesulfonic acid. This slurry (which clears on heating) is heated to reflux under nitrogen. The water formed during the reaction is collected in a Stark and Dean tube. The reaction is stopped when the distillate is clear (about 2 hours). The excess benzyl alcohol is removed in vacuo. The residue is dissolved in benzene and washed with sodium bicarbonate followed by water, dried over anhydrous magnesium sulfate and concentrated in vacuo. The product is absorbed on 15 g. of acid-washed alumina and chromatographed over 75 g. of acid-washed alumina. The product is eluted with v./v. 1:1-311 ether-benzene. The eluate is evaporated and the combined product is crystallized from benzene-Skellysolve B, M.P. 147448".

Microaizalysis.--Calcd. C, 66.66; H, 4.97; N, 8.64. Found: C, 66.83; H, 4.77; N, 8.52.

EXAMPLE 18 Benzyl- [1 5 -pyrimidinyl carbonyl) -2-methyl-5- nitr-3-indolyl] acetate In a dry 125 ml. flask is placed 3.0 g. of benzyl-(2- methyl-S-nitro-3-indolyl) acetate in 60 ml. of dry dimethylformamide. To this solution, cooled to 0 C. in a nitrogen atmosphere is added 0.475 g. of 50% sodium hydride-mineral oil. This is stirred for 30 minutes. Then 2.32 g. of p-nitrophenyl pyrimidine-5-carboxylate in ml. of dry dimethylformamide is added dropwise over a 5-minute period. The reaction mixture is stirred at 0 C. for 4 hours under a nitrogen atmosphere followed by stirring at room temperature under nitrogen overnight. It is then poured into an ice water-ether mixture. The ether layer is separated and the aqueous layer is washed with ether. The combined ether extracts are acidified with an ether solution of dry hydrogen chloride and the ether is decanted. The residue is washed with ether and then stirred with aqueous NaHCO solution. The alkaline mixture is extracted tracts are dried with anhydrous sodium sulfate and concentratedin vacuo to dryness. The product, benzyl[1- (S-pyrimidinyl carbonyl)-2-methyl-5 nitro-3-indolyl]acetate, is crystallized from benzene-Skellysolve B.

EXAMPLE l9 Mthyl-flt- [I-(5-pyrimidinyl carbonyl) -2-methyl-5- amino-S-z'ndolyl pro p ionate 0.025 mole of methyl-a-(1-nicotinoyl-2-methyl-5-nitro 3-indolyl)propionate in 100 ml. of ethanol is hydrogenated in the presence of 120 mg. of 10% palladium or charcoal catalyst at 40 psi. at room temperature. After 0.075 In. of hydrogen has been consumed, the hydrogenation is stopped, and the solution filtered to remove the catalyst. The filtrate is concentrated to dryness in vacuo to give methyl-a-[I-(S-pyrimidinyl carbonyl)-2-methyl- 5-amino-3-indolyl]propionate.

with ether and the exl 4 EXAMPLE 20 Methyl [1- (Z-triflaoromethyl-4-hydroxypyrimidyl- 5 -carb0xy -2-meihyZ-5 -m.etlz0xy-3 indolyl acetate (A) Methyl-Z-trifluoromethyl 4 carboxylale.A mixture of 0.5 mole of Z-trifiuoromethyl- 4-chloropyrimidine-5-carboxylic acid and 1500 ml. of 2 N methanolic HCl is refluxed 2 hours. The solvent is evaporated and the residue is dissolved in ether. The ether solution is washed with dilute aqueous NaHCO and then dried. Evaporation of the solvent gives methyl- 2-trifluoromethyl-4-chloropyrimidine-S-carboxylate.

(B) Methyl-2-trifluoromethyl-4-benzyloxypyrimidine-5- carboxylate.-To a solution of 0.1 mole of benzylalcohol in 300 ml. of l,2-dimethoxyethane is added slowly 0.1 mole of sodium metal. When evolution of gas has ceased, there is added 0.1 mole of the product of part A. The mixture is refluxed four hours and then concentrated to ml. It is then added to 500 ml. of water and the mixture is extracted twice with 250 ml. of ether. The

chl0r0pyrimidine-5- to give methyl 2-trifluoromethyl-4-benzyloxypyrirnidine-5- carboxylate.

in vacuo and the residual mixture is diluted with one liter of Water. The mixture is extracted with ether and the aqueous layer is then acidified. The precipitated 2-trifiuoromethyl-4-benzyloxypyrimidine-S-carboxylic acid is isolated by filtration and dried.

(D) Methyl [1-(2 trifluoromcthyZ-4-benzyloxypyrimidyl-4-carb0ay -2-metlzyl-5-meth0xy-3-ind0ly l] acetate. The procedure of Example 3A is followed using the acid prepared in part C, to produce p-nitrophenyl Z-trifluoromethyl-4-benzyloxypyrimidine-4 carboxylate. This is then used in the procedure of Examples 3B to produce methyl[l-(Z-trifiuoromethyl 4 benzyloxypyrimidyl-5- carboxy) -2-methyl-5-methoxy-3-indolyl] acetate.

(E) MethyZU-(4-hydroxypyrimidinyl 5 carbonyD-Z- methyl-5-methoxy-3-ind0lyl]acetate.--A solution of 0.1 mole of the product of part D in m]. of methanol is shaken with 3 g. of palladium on charcoal and hydrogen until hydrogen uptake ceases. The catalyst is filtered and the filtrate is taken to dryness in vacuo to yield methyl [l-(2 trifluoromethyl-4-hydroxypyrimidinyl-5-canbonyl)- 2-methyl-5-methcxy-3-indolyl]acetate.

(F) When 2 ethylmercapto-4-chloropyrimidine-5-carboxylic acid is used in the procedure of part A and the product is used successively in the procedures of parts B, C, D and E, there is obtained methyI[l-(2-ethylmercapto-4-hydroxypyrimidy 5 carboxy)-2-methyl-5-rnethoXy-3-indolyl1acetate.

EXAMPLE 21 (A) Methyl [1 (pyrimidinyl-S-carbonyl) -2-melhyl-5- bis(fl-hydr0xyethyl) amino-.i-z'ndolyl] acetaZe.-A mixture of 0.02 mole of methyl-(xil-pyrimidinyl-S-carbonyl)-2- methyl-5-amino-3-indolyl]propionate, 0.044 mole ethylene oxide and 0.03 mole of acetic acid in 300 ml. dimethoxyethane is heated to 100 for 18 hours in an autoclave. The mixture is then diluted with water and filtered to yield crude methyl[1-(pyrimidinyl-S-carbonyl) Lmethyl-S-bis (,B-hydroxyethyDamino 3 indolyl]propionate.

When an equivalent amount of propylene oxide is used in the above procedure in place of the ethyleneoxide, there is obtained methyl[l-(pyrimidinyl-S-carbonyl)-2-methyl- S-bis (hydroxypropyl amino-3-indolyl] propionate.

(B) MethylU (pyrimidinyl-S-carbanyl) -2-metltyl-5- (4 '-mcthyl-1 -piperazinyl) -3-z'nd0ly l] acetate.-The pro d-- not of A is stirred at 0 in pyridine with two mole proporons of p-toluenesulfonyl chloride until the reaction is ubstantially complete. The mixture is poured into vater and the S-bis (p toluenesulfonyloxy ethyl)amino ompound is isolated. This is dissolved in benzene and the mole proportion of methylamine is added. The mixure is allowed to stand at room temperature for 3 days. Fhe mixture is poured into iced water containing two equivalents of sodium carbonate and extracted with ether mmediately. Evaporation of the ether yields methyl [1- :pyrimidinyl carbonyl) 2 methyl-5-(4'-rnethyl-1- piperazinyl -3-indolyl] acetate.

Either of the above products that form part A or part B, when used in the procedure of Example 7, gives the corresponding free acid.

EXAMPLE 22 Methyl [1-(pyrimidinyl-5-carbonyl) -2-methyl-5- (4'-morph0linyl) -3-indolyl]acetate A solution of tosyl chloride (0.1 mole) in 200 ml. benzene is added dropwise with stirring to a solution of methyl-a-[1-(pyrimidinyl-5-carbonyl)-2-methyl 5 bis (fl-hydroxyethyl)amino-3-indolyl1acetate (0.1 mole) and pyridine (0.3 mole) in 300 ml. benzene at room temperature over a period of one hour. The mixture is then heated under reflux for 3 hours, washed with Water, dried over sodium sulfate and evaporated to a syrup. Chromatography of the syrup on an alumina column using 30- 50% (v./v.) ether in petroleum ether as the eluent gives methylfil (pyrimidinyl-S-carbonyl)-21nethyl 5 (4- morpholinyl) -3-indoly1'] acetate.

The above product, when used in the procedure of Example 7, gives the corresponding free acid.

EXAMPLE 23 (A) 2-methyl-5-cyano-3-ind0lylacetic acid methyl ester.-A solution of p-cyano phenylhydrazine (0.1 mole) and levulinic acid (0.1 mole) in 200 ml. concentrated hydrochloric acid is heated at 90 for minutes and diluted with iced Water (400 ml). The crude product which separates is extracted with ether and chromatographed on a silica gel column to give 2-methyl-5-cyano- 3-indolylacetic acid using 20-50% (v./v.) ether and petroleum ether as the eluent.

The methyl ester is prepared :by treatment with diazomethane in ether until the yellow of diazomethane persists and the mixture is evaporated.

(B) Mcthyl-a-[l (pyrimidinyl-S-carbonyl)-2-methyl- 5-cyan0-3-ind0lyl]acetate.-Acylation of the ester (prepared in Example 23A above) in dimethylformamide with sodium hydride and p-nitrophenyl nic-otinate by the procedure of Example 3, gives methyl[1-(pyrimidinyl-5- carbonyl) -2-methyl-5-cya.no-3-indolyl1 acetate.

(C) Methyl-(z-[l-(pyrintidinyl 5-carb0nyl)-2-methyl- S-aminometltyl-3-ind0lyl]acetate-The S-cyano ester perpared in Example 233 is hydrogenated in ethanol in the presence of Raney nickel and 3 moles of anhydrous ammonia at 2000 -p.s.i. at room temperature to give, after filtration of the catalyst and evaporation of the reaction mixture, methyl[1-(pyrimiclinyl-Scarbonyl) Z-methyl-S- amino-methyl-3-indoly-l] acetate which can be recrystallized from aqueous ethanol.

(D) MethyIU-(pyrimidinyl 5-carb0nyl)-2-methyZ-5- dimethylaminomethyl 3-ind0lyl]acetate.-Treatment of the above a-aminomethyl indole with 2 moles of methyl iodide gives the S-dimethy-lamino methyl derivative. When ethyliodide is used in place of methy liodide, the 5- diethyl-aminomethyl derivative is obtained.

(E) When the products of Examples 23C and 23D above are used in the procedure of Example 7, the corresponding free acids are obtained.

l 6 EXAMPLE 24 oc- [1 -(pyrimidinyl-5-carb0nyl) -2-methyl-5- methoxy-3-ind0lyl] butyric acid When the procedure of Examples 1 and 2 are followed using ethyl a-ethyl levulinate in place of ethyl OL-Il'lfithYl levulinate, there is obtained successively ethyl a-(Z-methyl-5-methoxy-3-indolyl)butyrate and ethyl oc-[l-(pyl'lmidinyl-S-carbonyl) -2-methyl-5-methoxy-3-irrdolyl] butyr-ate. When the latter product is used in the procedure of Example 7, the corresponding butyric acid derivative is obtained.

The starting ethyl a-ethyl levulinate is prepare-d by alkyl-ation of the sodio derivative of ethyl acetoacetate in ethanol with 1 m. of ethyl a-bromobutyrate, followed by hydrolysis and decarboxylation. The oc-ethyl levulinic acid obtained in reesterified with 2 N ethanolic hydrogen chloride at reflux temperature for 18 hours.

EXAMPLE 25 6.5 g. (0.02 mole) of a-[1-(py-rimidinyl-S-carbonyl)- Z-methyl-S-methoxy3-in-dolyl]acetic acid is added to 50 ml. of water which has been flushed with nitrogen. The slurry is stirred under nitrogen and 20 ml. of 1.05 N sodium carbonate added with stirring. When a clear solution is obtained, a solution of 2.2 g. of Al (SO .-1*8H O in 8 ml. of water is added With vigorous stirring. The mixture is stirred until it is homogenous and the solid aluminum salt of [1-(pyrimidinyl-S-carbonyl)-2-methyl- 5-methoxy-3-indolyl]acetic acid, is recovered by filtration and washed with Water and with ethanol.

In a similar fashion, there may be prepared the sodium and aluminum salts as well as other salts, such as the potassium, iron and magnesium salts, of the various (3- indolyl)aliphatic acids described in the accompanying examples.

EXAMPLE 26 1- (pyrimidinyl-S-carbonyl) -2-methyl-5-methoxy- 3-ind0lyl1acetic anhydride The procedure of Example 5A is followed using 1-[ (pyrimidinyl-S-carbonyl) 2-methyl-5 methoxy-3-indoly1] acetic acid in place of the l-unsubstituted acid. The product, 1-(pyrimidinyl-S-carbonyl) 2-methyl-5-methoxy-3- indolylacetic anhydride, is found on testing to be about equal to the free acid in the alleviation of inflammation.

When any of the other l-substituted free indolyl acids herein described are used in the procedure of Example 5A, the corresponding anhydride is obtained.

EXAMPLE 27 Ethyl-u-[1-(pyrimidinyl-S-carbcmyl) -2-methyl- 5-eth0xy-3-indolyl] propionate The procedure of Example 1A is followed using an equivalent quantity of p-ethoxyphenylhydrazine hydrochloride in place of the methoxyphenylhyd-razine to give ethyl-OMZ-methyl-S-ethoxy-3-indolyl)propionate. When this is used in the procedure of Example 3, there is obtained ethyl-u-[l (pyrimidinyl-S-carbonyl) Z-methyl-S- methoxy-3-indolyl]propionate. This product, when used in the procedure of Example 7, yields the corresponding free oL-lIldOlYl propionic acid.

Similarly, when p-propoxy, p-butoxy, p-benzyloxy, p-4- methylbenzyloxy, p-4-rnethoxybenzyloxy, p-4-chlorobenzyloxy phenyldrazine are used in the above procedures, the correspondingly 5-substituted indolyl acids are obtained. When the 1(pyrlmidinyl-S-carbonyl)-2-methyl S-benzyloxy-(or substituted benzyl-oxy)-3-indolyl propionic acids so prepared are subjected to catalytic hydrogenation over palladium, there is obtained a-[l-(pyrimidinyl-S-carbonyl) Z-methyl-S-hydroxy-3-indolyl] propionic acid.

When the procedure of Example 1A is fol-lowed, using in place of the p-methoxyphenylhydrazine, equivalent amounts of pethylphenylhydrazine, p-butylphenylhydrazine, p-tritluoromethylphenylhydrazine, p-chlorophenylhydrazine and p-fluorophenylhydrazine (each obtainable by diazotization of the corresponding p-substituted aniline and reduction of the diazo) and the result-ant indolyl ester is acylated by the procedure of Example 3 and further treated by the procedure of Example 7, the corresponding 5-substitute-d indolyl esters and acids are obtained.

When the procedure of Examples 1A, 3 and 7 are followed starting with phenylhydrazine, the corresponding S-unsubstituted indolyl esters and acids are produced.

EXAMPLE 28 1-pyrazinoyl-2-methyl-5-methoxy-3-ind0lyl acetamide To a suspension of 1.0 g. of 50% sodium hydride in 80 ml. benzene is added 4.4 g. of 2-methyl-5-methoxy- S-indolylacetamide with stirring. Twenty ml. of dimethylformamide is then added, followed by 2.8 g. pyrazinoyl chloride twenty minutes later. The reaction mixture is stirred at room temperature for one hour and then poured into 400 ml. of ice and water. The precipitate is collected on a filter. The crude product is chromatographed on neutral alumina using ethylacetate-ether mixture (v./v. 50%) as eluent.

EXAMPLE 29 I-pyrazinoyZ-Z-metlzyl-5-methoxy-3-ind0lyl acetic acid EXAMPLE 30 The procedure of Example 1A is followed using an equivalent quantity of each of the following phenylhydrazines in place of the p-methoxyphenyl hydrazine; p dimethylsulfonamidophenylhydrazine, p benzylmercaptophenylhydrazine, p-vinylphenylhydrazine.

When the resulting indolyl acid is acylated by the procedure of Example 3, the corresponding l-(pyrimidinyl- 5-carbonyl)indolyl acids are obtained.

EXAMPLE 31 Methyl [1-(pyrimidinyl-5-carb0nyl)-2-methyl-5-allyloxy- 3-ind0lyl] acetate (A) Methyl 5 hydroxy-Z-methyl-3-inaolyl acetate-- A mixture of 10 g. of methyl 5 methoxy-2-methyl-3- indolyl acetate and 50 g. of pyridine hydrochloride is heated at 180 under nitrogen for minutes. The reaction mixture is then cooled to about 50, dissolved in 150 ml. of 1.5 N methanolic hydrogen chloride and refluxed for 2 hours. After cooling, the solution is concentrated in vacuo, poured into water and extracted with ether. The ethereal solution is washed with water and extracted three times with 50 ml. of 5% sodium hydroxide. The combined aqueous extract is acidified to pH 6 and extracted with ether. After drying over sodium sulfate, the ethereal solution is evaporated to give methyl S-hydroxy- 2-methy1-3-indolyl acetate, recrystallized from benzene, M.P. 158-l70 (3.4 g).

(B) Methyl 2 methyl-5-allyloxy-3-indolyl acetate.- A mixture of 3.4 g. of the S-hydroxyindole, 2.4 g. of allylbromide and 7.5 g. of potassium carbonate is stirred at room temperature to 56 for 18 to 6 hours. The reaction mixture is filtered, concentrated in vacuo to a syrup and chromatographed on 60 g. of silica gel, using v./v. 50% ether in petroleum ether as eluent to give 0.7 g. of methyl 5-allyloxy-2-methyl-3*indolyl acetate as an oil.

(C) I (pyrimidinyl-S-carbonyl)-2-methyZ-5-allyl0xy- 3-ind0lyl acetate.-The procedure of Example 3 is 01- over a period of three hours.

EXAMPLE 32 3-trifltroromethylpheizylhydrazine 250 m1. of chilled concentrated hydrochloric acid is slowly added with stirring, to 0.40 of a mole of freshly distilled 3-aminobenzotrifluoride, which is kept cooled in an ice salt bath. When the temperature of the above suspension is 0", a precooled solution of 0.40 of a mole of sodium nitrite in ml. of water is added through a separating funnel, whose tip is immersed below the surface of the suspension. The addition is carried out over 75 minutes, maintaining the reaction below 3 A chilled solution of 0.89 mole of stannous chloride dihydrate in 200 ml. of concentrated hydrochloric acid is then added dropwise to this stirred and cooled diazonium solution, During this addition, the temperature is maintained at 05 and after the addition, the solution is stirred for an additional hour at 0. The resulting solid is collected by filtration, pressed as dry as possible and then shaken with 700 ml. of 25% sodium hydroxide. The yellow mixture obtained is allowed to stand overnight at room temperature. The mixture is then extracted with three 300 ml. portions of benzene. The combined filtered benzene solution is dried over 20-30 g. of potassium hydroxide. Distillation, under vacuum, of this benzene solution gives 3-trifluoromethylphenylhydrazine.

When equivalent amounts of Z-aminobenzotrifluoride, 4-methoxy-3-trifiuoromethylaniline, 4-methoxy-2-trifluoromethylaniline, or 4-methyl-3-trifiuoromethylaniline is employed in the above procedurein place of 3-aminobenzotrifluoride, there is obtained 2-trifluoromethylphenylhydrazine, 4-methoxy-3-trifluoromethylphenylhydrazine, 4- methoxy 2 trifluoromethylhydrazine, or 4-methyl-3-trifluoromethylphenylhydrazine, respectively.

EXAMPLE 33 Methyl-4- and 6-triflu0romethyl-3-indoly[acetate 0.2 mole of methyl-y,' -dimethoxybutyrate is added, dropwise, with stirring to a solution of 0.2 mole of 3-trifluoromethylphenylhydrazine in 75 ml. of 50% acetic acid. The mixture is allowed to stir at room temperature for three hours, and then 300 ml. of water is added. The crude hydrazone which separates out is collected and dried in vacuo. 0.04 mole of the dried hydrazone is then intimately mixed with 0.85 mole of freshly fused zinc chloride. To this mixture is added, with stirring, for 5 minutes at room temperature, ml. of glacial acetic acid and 5 ml. acetic anhydride. The mixture is then refluxed for one hour and cooled to room temperature. This resulting mixture is poured onto chopped ice and water and allowed to stand overnight in a refrigerator. The solid is collected and precipitated by filtration and chromatographed on acid-washed alumina and eluted with ether-petroleum ether (v./v. 5-50%). The two isomers which are obtained, namely, methyl-(4-trifluoromethyl-3- indolyl)acetate and methyl-(6-trifluoromethyl-3-indolyl) acetate are differentiated by nuclear magnetic resonance spectroscopy.

When equivalent amounts of 4-methoxy-3-trifluoromethylphenylhydrazine, or 4,-methyl-3-trifluoromethylphenylhydrazine is employed in the above procedure in place of 3-trifiuoromethylphenylhydrazine, there is ob tained both isomers of each, namely, methyl-(S-methoxy- 4-trifluoromethyl-3-indolyl) acetate, methyl-'( S-methoxyai- Methyl-a-[4 or 6-tr ifluoromethyl-3-ind0lyl]propionate When the procedure of Example 40 is followed, using methyl 'y,'y dimethoxy or methylbutyrate in place of methyl-'y -dimethoxybutyrate, there are obtained two isomers, namely, methyl-a-(4-trifluoromethyl-3-indolyl)pro- .pionate and methyl-ot-(6-trifluoromethyl-3-indolyl)propionate.

When equivalent amounts of 4-methoxy-3-trifluoromethylphenylhydrazine, or 4-methyl 3 trifluoromethylphenylhydrazine is employed in place of 3-trifiuoromethylphenylhydrazine, there are obtained both isomers of each, namely, methyl-a-(S methoxy-4-trifluoromethyl-3-indolyl)propionate, methyl-a-(-meth0xy-6-trifluoromethyl-3- indolyl)propionate, methyl-a45-methyl-6-trifluoromethyl- 3-indolyl)propionate, respectively.

Similarly, when equivalent amounts of Z-tn'fiuoromethylphenylhydrazine, 4-methoxy 2 trifiuoromethylphenylhydrazine or 4-methyl-2-trifluoromethylphenylhydrazine is employed in place of'3-trifluoromethylphenylhydrazine, there is obtained methyl-oc-(7-trifiuoromethyl- 3-indolyl)propionate, methyl oz (5-methoxy-7-trifiuoromethyl-3-indolyl)propionate or methyl-a-(5-methyl-7-t1ifiuoromethyl-3-indolyl)propionate, respectively.

EXAMPLE Methyl-(2-methyl-4 or 6-triflu0r0methyl-3-ind0lyl)acetate When the procedure of Example 33 is followed, using methyl levulinate in place of methyl-vq-dimethoxybutyrate, there is obtained two isomers, namely, methyl-(2- methyl-4-trifluoromethyl-3-indolyl)acetate and methyl-(2- methyl-6-trifluoromethyl-3 -indoly1) acetate.

When equivalent amounts of 4-methoxy-3-trifluoromethylphenylhydrazine, or 4-methyl 3 trifiuoromethylphenylhydrazine is employed in place of 3-trifiuoromethy1- phenylhydrazine, there is obtained both isomers of each, namely, methyl- (5-methoxy-2-methyl-4-trifluoromethyl-3- indolyl)acetate, methyl-(5-rnethoxy-2-methyl-6-trifluoromethyl-3-indolyl) acetate; methyl-(2-methyl-5-nitro-6-trifluoromethyl-3-indolyl) acetate; or methyl-(2,5-dimethyl- 4-trifluoromethyl-3-indolyl) acetate; methyl-(2,5-dimethyl- 6-trifluoromethyl-3-indolyl) acetate, respectively.

Similarly, when equivalent amounts of Z-trifluoromethylphenylhydrazine, 4-methoxy-2-trifiuoromethylphenylhydrazine, or 4-methyl-2-trifiuoromethylphenylhydrazine is employed in place of 3-trifluoromethylphenylhydrazine, there is obtained methyl-(2-methyl-7-trifluoromethyl-3 -indolyl) acetate, methyl- 5-methoxy-2-methyl-7- trifluoromethyl 3 indolyl)acetate, or methyl (2,5-dimethyl-7-trifiuoromethyl-3-indolyl) acetate, respectively.

EXAMPLE 36 M ethyl-tx-(Z-methyltrifluoromethw Z-S-indolyl p ropionate When the procedure of Example 33 is followed, using methyl-ot-methyl levulinate in place of methyl-dimethoxybutyrate, there is obtained two isomers, namely, methylct-('2-methyl-4-trifluoromethyl 3 indolyl)propionate and methyl a (2 methyl-6-trifluoro-methyl-3-indolyl)propionate.

When equivalent amounts of 4-methoxy-3-trifluoromethylphenylhydrazine or 4-methyl 3 trifluoromethylphenylhydrazine is employed in place of 3-trifluoromethylphenylhydrazine, there is obtained both isomers of each, namely, methyl-ot-(5-methoxy-2-methyl-4-trifluorornethyl- 3 indolyl)propionatc, methyl-a45-methoxy-2-methyl-6- trifluoromethyl-3-indolyl)propionate; or methylot-(2,5- dirnethyl 4 trifluoromethyl-3-indolyl)propionate and methyl-a-(2,5 dimethyl-6-trifiuoromethyl-3-indolyl)propionate, respectively.

Similarly, when equivalent quantities of 2-trifluoromethylphenylhydrazine, 4-methoxy 2 trifluoromethylphenylhydrazine or 4-methyl-2-trifluoromethylphenylhydrazine is employed in place of 3-trifluoromethylphenylhydrazine, there is obtained methyl-ot-(2-methyl-7-trifiuoromethyl-3-indolyl)propionate or methyl-a-(Zfi-dimethyl-7-trifluoromethyl 3 indolyl)propionate, respectively.

EXAMPLE 37 1-[ (Pyrimidinyl-S-carbonyl) -4-triflu0r0methyl- 3-indolyl1acetic acid (A) A solution of 0.05 mole of methyl-(4-trifluoromethyl-3-indolyl)acetate and 0.01 mole of sodium in 60 ml. anhydrous benzyl alcohol is slowly fractionated over a period of 4 /2 hours through a Vigreux column to remove methanol. The excess .benzyl alcohol is removed by distillation at 60 and 2.5 mm. to give a residue of crude benzyl-(4-trifluoromethyl-3-indolyl)acetate.

(B) A suspension of 0.046 mole of 50% sodium hydride-mineral oil in 250 ml. of dimethylformamide is stirred for 20 minutes under nitrogen, with ice-cooling. Then 0.035 mole of p-nitrophenyl pyrimidine-S-carboxylate in 50 ml. of dimethylformamide is added dropwise over a period of 30 minutes. The mixture is stirred in an ice bath for 5 hours under nitrogen, then poured into a mixture of 500 ml. of ether, 5 ml. of acetic acid and 1.1 of iced water. The organic products are extracted with c. 300 ml. of ether. The ether solutions are combined and acidified with an ether solution of dry HCl. The ether is decanted and the residue is washed with ether and then mixed with aqueous NaHCO The mixture is extracted with ether and the extracts are dried over sodium sulfate. The solution is then evaporated to near dryness and the residue charged onto a 300 g. alumina column. The benzyl[1-(pyrimidinyl-S-carbonyl)- 4-trifluoromethyl-3-indoly1]acetate is eluted with etherpetroleum ether (550% v./v.).

(C) 0.02 mole of the ester obtained in Part B is added to 50 ml. of ethyl acetate containing a drop of acetic acid and is reduced catalytically at room temperature in the presence of palladium on charcoal catalyst. Upon completion of the reduction, the catalyst is removed by filtration and the filtrate evaporated to yield [l-(pyrimidinyl-S-carbonyl) 4 trifluoromethyl 3 indolyl] acetic acid.

When the methyl esters described in Examples 34, 35, 36 and 37 are used in the above procedures, the corresponding 1-(pyrimidinyl-S-carbonyl)-3-indolyl acetic or 3-indolyl-a-propionic acid derivatives are obtained.

When, in the above procedure, the p-nitrophenyl esters of pyrazinoic acid, pyridazine-S-carboxylic acid, pyrimidine-4-carboxylic acid or pyridazine-4-carboxylic acid are used in place of the pyrimidine-5-carboxylate, the corresponding 1-acyl-3-indolyl acids are obtained.

EXAMPLE 3 8 Methyl [1 (6-mercapto-2-methylthi0pyrimidinyl-4-carbonyl) -2-methyl-5-meth0xy-3-ind0lyl1 acetate The procedures of Examples 20A, 20B and 20C are followed, using 6-mercapto-Z-methylthiopyrimidine-4-carboxylic acid in the procedure of Example 20A and the product thereof successively in 20B and 20C, to produce methyl[1-(6-mercapto 2 methylthiopyrimidinyl 4-carbonyl) -2-methyl-5 -methoxy-3-indolyl] acetate.

21 EXAMPLE 39 [I- (pyrimidinyl-5-carb0nyl-5-hydroxy-4-triflu0romelhyl-3-indolyl1acetic acid 0.001 mole of 1-(pyrimidinyl-S-carbonyl)-5-methoxy- 4-trifluoromethyl-3-indolylacetic acid is added portion- Wise, with stirring, to 1.5 g. of pyridine hydrochloride at 160-220. On cooling, the residue is dissolved in a small amount of water and extracted with ether to remove starting material. The aqueous solution is adjusted to pH 6.5 and diluted with ethanol to precipitate the zwitterion 1-(pyrimidinyl-S-carbonyl) 5 hydroxy 4 trifiuoromethyl-3-indo1ylacetic acid, which is recrystallized from aqueous ethanol. 1

EXAMPLE 40 Propyl [1 (pyrimidinyl-5-carbonyl -4-triflu0r0- methyl-3-indolyl] acetate A solution of 0.0054 mole of N,N'-dicyclohexylcarbodiimide in 60 ml. of anhydrous tetrahydrofuran is added to a solution of 0.005 mole of 1-(pyrimidinyl-5-carbonyl)- 4-trifiuoromethyl-3-indolylacetic acid and 0.0054 mole of n-propyl alcohol in 25 ml. of anhydrous tetrahydrofuran. The reaction mixture is shaken vigorously and allowed to stand at room temperature overnight. The dicyclohexylurea 1's filtered off and 2 ml. of glacial acetic acid is added to the filtrate. The mixture is allowed to stand for one hour. The solution is filtered and about 200 ml. of ether is added to the filtrate. This filtrate is then extracted well with water. The ether solution is dried over sodium sulfate and concentrated in vacuo. The crude material is chromatographed on neutral alumina using ether-petroleum ether (v./v. 20-50%), to obtain propyl 1-nicotinoyl-4-trifluoromethyl-3-indolylacetate.

EXAMPLE 41 2-flaoro-4-methylpheny lhydrazine 150 ml. of concentrated HCl is slowly added with stirring to 0.1 mole of 2-fluoro-4-methylaniline. When the temperature of this suspension is at l, 0.1 mole of 40% sodium nitrite solution is added. The above addition is carried out over 75 minutes, maintaining the temperature below --5. A chilled solution of 0.3 mole of stannous chloride in 75 ml. of concentrated hydrochloric acid is then added, dropwise, to this stirred and cooled diazonium solution, over a period of three hours. During this addition the temperature is maintained at 0-5" and after the addition the solution is allowed to remain at 0 for several hours. The mixture is then filtered and the cake washed with cold sodium chloride solution. This solid is then added to 100 ml. of saturated sodium acetate solution, extracted with ether and the ether dried. This crude 2-fluoro-4-methylphenylhydrazine is finally isolated and purified as its hydrochloride.

When equivalent amounts of 3-fiuoro-4-methyl aniline, 2-fluoro-4-rnethoxyani1ine, or 3 -fiuoro-4-methoxyaniline is used in the above procedure in place of 2-fluoro-4- methylaniline, there is obtained 3-fluoro-4-methylphenylhydrazine, 2 fiuoro 4 methoxyphenylhydrazine or 3- fluoro-4-methoxyphenylhydrazine, respectively.

EXAMPLE 42 Methyl-4 0r 6-flu0r0-3-ind0lyl acetate 0.07 mole of 3-fluorophenylhydrazine and 0.08 mole of methyl- -dimethoxybutyrate are added to 250 ml. of 2 N ethanolic hydrogen chloride and the mixture warmed until reaction sets in. After the initial exothermic reaction stops, the mixture is refluxed for about one-half hour and then concentrated in vacuo to about one-third volume. Four hundred ml. of water are added and the aqueous solution extracted with ether. The ether extracts are washed with sodium bicarbonate solution, water, and then dried over sodium sulfate. The ether solution is concentrated to a small volume in vacuo and chromatographed over 200 g. of acid-washed alumina.- The material is eluted with ether-petroleum ether (v./v. 50-60%) and distilled in a short-path distillation apparatus. Both isomers, namely, methyl-4-fiuoro-3-indolyl acetate and methyl-6-fluoro-3-indolyl acetate are obtained. The structures of these two isomers are differentiated by means of nuclear magnetic resonance spectroscopy.

When an equivalent amount of 3-fiuoro-4-methylphenylhydrazine, 3-fiuoro-4-methoxyphenylhydrazine is employed in place of 3-iluorophenylhydrazine, there is obtained both isomers of each, namely, mehyl-(4-fiuoro- 5 methyl-3-indolyl)acetate, methyl-(6-fluoro-5-methyl- 3 indolylyacetate or methyl-(4-fluoro-5-methoxy-3-indolyl) acetate, methyl- (6-fluoro-5-methoxy-3-indolyl)acetate, respectively.

Similarly, when an equivalent amount of 2-fluorophenylhydrazine, Z-fluoro 4 methylphenylhydrazine or 2- fiuoro-4-methoxyphenylhydrazine is employed in place of 3-fluorophenylhydrazine, there is obtained methyl-(7- fluoro-3 -indolyl) acetate, methyl- 7 -fluoro-5 methyl-3 -indolyl)acetate, or methyl-(7-fiuoro-5-methoxy-3-indolyl) acetate, respectively.

EXAMPLE 43 Metlzyl-a-[4- or d-flaoro-S-indolylJpropionate When the procedure of Example 42 is followed, using methyl-'y,'y-dimethoxy-u-methylbutyrate in place of methyl-ygy-dirnethoxybutyrate, there is obtained two isomers, namely, methyl-ot-(4-fiuoro 3 indolyl)propionate and methyl-a- 6-fiuoro-3 -indolyl) propionate.

When an equivalent amount of 3-fiuoro-4-methylphenylhydrazine, 3-fiuoro-4-methoxypehnylhydrazine or 4-nitrophenylhydrazine is employed in place of 3-fluorophenylhydrazine, there is obtained both isomers of each, namely, methyl-a-(4-fluoro-5-methyl 3 indolyl)propionate, methyl-w 6-fiuoro-5methyl-3 -indolyl propionate, or methyl-(z-(4-fluoro-5-methoxy 3 indolyl)propionate, methyl-a-(6-fluoro-5-methoxy 3 indolyDpropionate, respectively.

Similarly, when an equivalent amount of 2-fiuorophenylhydrazine, 2-fluoro 4 methylphenylhydrazine or 2- fiuoro-4-methoxyphenylhydrazine is employed in place of 3-fluorophenylhydrazine, there is obtained methyl-a-(7- fluoro-3-indo1yl)propionate, methyl-OM7-fluoro-5-methy1- 3-indolyl)propionate or methyl-u-(7-iluoro-5-methoxy-3- indolyl)propionate, respectively.

EXAMPLE 44 Methyl-4 or 6-fla0r0-2-methyI-S-indolyl acetates When the procedure of Example 42 is followed, using methyl levulinate in place of methyl-qyy-dimethoxybutyrate, there is obtained two isomers, namely, methyl- (4-fluoro-2-methyl 3 indolyl)acetate and methyl-(6- fluoro-2-rnethyl-3 -indolyl) acetate.

When an equivalent amount of 3-fiuoro-4-methylphenylhydrazine, 3-fluoro-4-methoxyphenylhydrazine, or 3- fluoro-4-nitrophenylhydrazine is employed in place of 3- fluorophenylhydrazine, there is obtained both isomers of each, namely, methyl-(2,5-dimethyl-4-fiuoro-3-indolyl) acetate, methyl-(4-fluoro-5-methoxy-2-methyl-3-indolyl) acetate, methyl-(6-fiuoro-5-methoxy-2-methyl-3-indolyl) acetate, respectively.

Similarly, when an equivalent amount of Z-fluorophenylhydrazine, 2-fiuoro-4-methylphenylhydrazine, or 2- fluoro-4-methoxyphenylhydrazine is employed in place of 3-fluorophenylhydrazine, there is obtained methyl-(7- fiuoro-2-methyl-3 -indolyl acetate, methyl 2,5 -dimethyl-7- fluoro-3-indoly1)acetate, or methyl-(7-fluoro-5-methoxy- 2-methyl-3 -indolyl) acetate, respectively.

When the procedure of Example 42 is followed using methyl-a-methyl levulinate in place of methyl- -dimethoxybutyrate, there is obtained two isomers, namely, methyl-a-(4-fluoro-2-methyl 3 indolyl)propion=ate and methyl-ix- 6-fluoro-2-methyl-3 --indolyl) propionate.

EXAMPLE 45 [1 (pyrimidiny l--carb0ny l) -4-flu0r0-3-ind0lyl] acetic aci d (A) A solution of 0.05 of a mole of methyl-(4-fluoro- 3-indolyl) acetate and 0.01 of a mole of sodium in 60 ml. of benzyl alcohol is slowly fractionated over a period of 4 /2 hours through a Vigreux column to remove methanol. The excess benzyl alcohol is then removed by distillation at 60 C. (2.5 mm.) to give a residue of benzyl- (4-fiuoro-3-indolyl) acetate.

(B) A suspension of 0.046 m. of 50% sodium hydridemineral oil in 250 ml. of dimethylforrnamide is stirred for minutes under nitrogen with ice-cooling. Then 0.035 m. of the benzyl ester obtained in part A is added and the mixture stirred for 20 minutes. To the above mixture, 0.046 m. of p-nitrophenyl pyrimidine 50 carboxylate in 50 ml. of dimethylformamide is added dropwise over a period of 30 minutes. The mixture is stirred in an ice-bath for 5 hours under nitrogen. It is then poured into a mixture of 500 ml. of ether, 5 ml. of acetic acid and 1.1 of iced water. The organic products are extracted with 3x300 ml. of ether. The ether solutions are combined and acidified with an ether solution of dry HCl. The ether is decanted and the residue is washed with ether and then mixed with aqueous NaHCO The mixture is extracted with ether and the extracts are dried over sodium sulfate. The solution is then evaporated to near dryness and the residue charged onto a 300 g. neutral alumina column. The crude benzyl-(1-pyrimidinyl- 5-carbonyl)-4-fiuoro 3 indolyl)acetate is eluted with ether-petroleum ether (v./v. 1050%).

(C) 0.02 of a mole of the ester obtained in part B is added to 50 ml. of ethyl acetate containing a drop of acetic acid and is reduced catalytically at room temperature in the presence of palladium on charcoal catalyst. Upon completion of the reduction, the catalyst is removed by filtration and the filtrate evaporated to yield [1-(pyrimidinyl-S-carbonyl)-4-fluoro 3 indolyl]acetic acid.

EXAMPLE 46 to the anhydride from part A. The solution is refluxed for 16 hours and the excess alcohol is removed in vacuo. The residue is then dissolved in ether and washed several times with saturated salt solution, The ether extract is dried over magnesium sulfate and the solution treated with charcoal. The ether solution is then evaporated and flushed several times with Skellysolve B for complete removal of the alcohol. This residual oily ester is used without purification in the next step.

(C) (t-Butyl-[I-(pyrimidinyl 5 carbonyl)-6-methoxy-3-indolyl]acetate-.065 mole of the crude ester, as obtained in step B, is added to 450 ml. of dimethylformamide and cooled to 4 in an ice bath. .098 mole of a 50% suspension of sodium hydride is added portionwise to this stirred solution. After 15 minutes, 0.085 mole of p-nitrophenyl pyrimidine-S-carboxylate is added over a 10-minute interval. This mixture is then stirred for nine hours, without replenishing the ice bath. At this time, the mixture is poured into one liter of 5% acetic acid and extracted with ether. The ether solution is acidified with an ether solution of dry HCl. The ether is decanted and the residue is washed with ether and then mixed with aqueous NaHCO The mixture is extracted with ether and the ether extract is dried over magnesium sulfate. It is then treated with charcoal and evaporated to a residue. The crude product, thus obtained, is chromatographed on 600 g. of neutral alumina using a mixture of (v./v. 1050%) ether-petrolum ether as eluent.

(D) [l-(Pyrimidinyl 5 carbonyl)-6-mcth0xy-3-indolyljacetic acid.-A mixture of 1.0 g. of the ester obtained in step C and 0.1 g. powdered porous plate is heated, with stirring, in an oil bath at 210 C. under nitrogen for two hours. The product is isolated in the same manner as Example 5D.

(E) [l-(Pyrimz'dinyl 5 carbonyl)-7-m ethoxy-3-indolyflacetic acid.-When the procedure of parts A, B, C and D is used, starting with 7-methoxy-3-indolylacetic acid instead of the 6-rnethoxy instead of the 6-methoxy isomer, there is obtained 1-(pyrimidinyl-S-carbonyl)-7- methoxy-3-indolylacetic acid.

EXAMPLE 47 [1-(Pyrimidinyl-5-carb0nyl) -5,7-dimeth0xy-3-ind0lyl]- acetic acid (A) 5,7-dimethoxygramine.-A solution of 0.032 mole of 5,7-dimethoxyindole in 40 ml. dioxane is added dropwise, over a period of minutes, to an ice-cooled, stirred mixture of ml. of dioxane, 40 ml. acetic acid, 3.2 ml. of 36% aqueous formaldehyde and 8.8 ml. of 25% aqueous dimethylamine. The clear solution is stirred and cooled for two hours and then allowed to Warm up to room temperature overnight. To this solution is added 500 ml. of water. The turbid mixture is then treated with charcoal and filtered through a silicaceous filter aid. The clear filtrate is made alkaline With 400 ml. of dilute sodium hydroxide solution, and placed in a refrigerator, to cool. This mixture is then filtered and the solid gramine is washed with Water and dried.

(B) 5,7-dimcth0xyind0lyl-3-acet0nitrile.-0.106 mole of the gramine obtained in A is added to 420 ml. of methyliodide, with vigorous stirring, over a period of 20 minutes. The reaction mixture is then allowed to remain at 5 for 15 hours. The solution is filtered and the iodine metholate cake is dried at 50". This solid is dissolved in a solution of g. of sodium cyanide in one liter of water and warmed for 2 hours, at The desired product is extracted with chloroform which is then evaporated to give a crude oily product. The oil is then dissolved in 250 ml. of ether, filtered and the filtrate concentrated. This concentrate is then diluted with petroleum ether, at which point the 5,7-dimetl1oxy-indolyl-3-aceto nitrile precipitates. The mixture is then filtered and the cake dried.

(C) 5,7-dimethoxyind0lyZ-3-acetic acid.0.08 mole of the nitrile obtained from B is added to a solution of 140 ml. of alcohol, ml. of water and 4.3 g. of potassium hydroxide and refluxed for 15 hours. The mixture is brought to room temperature and 60 ml. of glacial acetic acid is added. The solution is then filtered through a tale filter and the filtrate diluted with 500 ml. of water. The

25 precipitated 5,7-dimethoxyindolyl-3-acetic acid is then filtered and dried.

(D) [1 (pyrimidinyl carbonyl) 5,7 dimethoxy-3-indolyl1acetic acid.The procedures of Examples 46A, 46B, 46C and 46D are followed using the product of part C of this example in place of the 6- methoxy-3-indolylacetic acid, to produce [l-(pyrimidinyl- 5 carbonyl) 5,7 dimethoxy 3 indolyljacetic acid. When 5,6-dimethoxy-3-indo1ylacetic acid is used in place of 6-methoxy-3-indolylacetic acid in the above procedure, there is obtained [1-(pyrimidinyl-S-carbonyl)-5,6-dimethoxy-3-indolyl1acetic acid.

When 5,6 methylenedioxyindole or 2 methyl 6- methoxyindole is used in place of 5,7-dimethoxyindole in the procedure of parts A, B, and C, there is obtained 2- methyl-6-methoxy-3-indolylacetic acid or 5,6-methylenedioxy-3-indolylacetic acid, which, where used in the procedure of part D gives [l-(pyrimidinyl-S-carbonyl)- 5,G-methylenedioxy-3-indolyl]acetic acid or [l-(pyrimt dinyl 5 carbonyl) 2 methyl 6 methoxy 3 indolyl]acetic acid.

EXAMPLE 48 Methyl-4-benzyloxy-3-in dolyl acetate (A) 4-benzyloxy-3-indolylacctonitrile.-The procedure of Examples 47A and 47B is followed, using 4-benzyloxyindole in place of the 5,7-dimethoxyindole, to give 4- benZyloxy-3-indolyl acetonitrile.

(B) Methyl 2-(4-benzyl0xyind0lyl-3)acetate-A mixture of 0.1 mole of (4-benzyloxyindolyl-3) acetonitrile in 150 ml. methanol, containing 30 g. dry hydrogen chloride, is refluxed for 2 hours. The reaction mixture is taken to dryness and the residue distributed between sodium bicarbonate solution and chloroform. The chloroform layer is dried with anhydrous sodium sulfate and taken to dryness in vacuo. The residue is reasonably pure ester.

Similarly, when 7-benzyloxy-3-indolylacetonitrile is used instead of the 4-isomer, there is obtained methyl-7- benzyloxyl-3-indolyl acetate. When 5-benzyloxyindo1e and 6-benzyloxyindole are used in the procedure of parts A and B of this example, there are produced methyl-S-benzyloxy- 3-indolyl acetate and methyl-6-benzyloxy-3-indolyl acetate.

EXAMPLE 49 [1 (Pyrimidinyl 5 carbonyl) 4 methoxy 3 indolyllacetic acid (A) Methyl 4-hy r0xy-3-irzdalyl acetate.--A solution of methyl 4-benzyloxy-3-indolyl acetate (4.0 g.) in 150 ml. methanol is shaken with 3 g. palladium on charcoal and hydrogen until the hydrogen uptake ceases. The catalyst is filtered and the filtrate is taken to dryness in vacuo.

(B) Methyl 4meth0xy-3-ind0lyl acetate.--A solution of methyl 4-hydroxy-3-indolyl acetate (105g, 0.065 m.) in 96 ml. 10% sodium hydroxide is stirred and treated with 7.5 ml. dimethyl sulfate. After stirring for several hours, the crude product is extracted with ether, washed with water and dried over sodium sulfate. The ether solution is evaporated in vacuo and the residue is chromatographed on 200 g. of acid-washed alumina using a mixture of ether-petroleum ether (v./v. -50%) as the eluent.

(C) 4-methoxy 3-indoly[acetic acid.-A solution of methyl-4-methoxy-3-indolyl acetate in excess 2 N absolute ethanolic potassium hydroxide is allowed to stand overnight, diluted with Water and extracted with ether. The

aqueous layer is acidified. Th6 precipitate is collected and recrystallized from aqueous ethanol.

(D) [1-(pyrimidinyl-S-carbonyl)-4-meth0xy-3-ind0lyl] acetic acid-The procedure of Examples 46A, 46B, 46C and 46D is followed using the product of part C in place of 6-methoxy 3-indolylacetic acid, to produce [l-(pyrimidinyl-S-carbonyl) -4-methoxy-3-indolyl] acetic acid.

26 EXAMPLE s0 [1- (pyrimidinyZ-5-carbonyl) -5-chl0r0-6-meth0xy-3-indolyl] acetic acid (A) 5-chl0r06-meth0xy-3-ind0lylacetic acid.When 5-ch1oro-6-methoxy-3-indolylacetonitrile is used in place of 5,7-dimethoxyindolyl-3-acetonitrile, in the procedure of Example 47C, there is obtained 5-chloro-64methoxy-3- indolyla-cetic acid.

(B) [1 (pyrimia inyl-5-carbonyl)-5-c.hloro-d-methoxy- 3-indolyl] acetic acid.-When the procedures of Examples 46A, 46B, 46C and 46D are followed, using 5-chloro-6- methoxy-3-indolylacetic acid as the starting material, there is obtained [1-(pyrimidinyl-S-carbonyl)-5-chloro-6-methoxy-3-indolyl] acetic acid.

(C) [1-(pyrimidinyl-5-carb0nyl)-Z-mtethyl-7-meth0xy 3-ind0lyl1acetic acidr when 2-methyl-7-methoxyindole is used in place of 5,7-dimethoxyindole in the procedure of Examples 47A, 47B and 47C and the product is used in the procedures of Examples 46A, 46B, 46C and 46D, there is obtained [1-(pyrimidinyl-S-carbonyl)-2-methyl-7- methoxy-3-indolyl1acetic acid.

EXAMPLE 51 [1 (pyrimidinyl-5-carb0nyl) -2-m ethyl-4-meth0xy-3- indolyl] acetic acid (A) 2 metlzyl-4-meth0xyind0le-(1) 6 mcth0xy-2- nitro benzoyl chl0ride. 0.046 mole of 6-:methoxy-2-nitrobenzoic acid is added to 60 ml. of redistilled thionyl chloide and refluxed for 2 hours. The excess reagent is removed under reduced pressure, maintaining the temperature below 40. The residue is Washed with benzene and then removed under reduced pressure. This residue is placed over sodium hydroxide, in vacuo overnight.

(2) DiazomcthyLd-methoxy-Z-nitr0phenyllcetone. A solution of .044 mole of the 6-methoxy-2-nitrobenzoyl chloride obtained from (1) in 30ml. of dioxane is added to a solution of 50 ml. of diazomethane in 200 ml. of ether, with agitation at 0. The reaction mixture is allowed to remain overnight at room temperature. The solvent is then removed under reduced pressure to yield a residue containing the ketone. The 6-rnethoxy-2-nitrophenyl diazomethyl ketone is crystallized from this residue using dioxane.

(3) 6-methoxy-Z-nitrophenylacetic aciaC-A solution of .044 mole of the dia'zoketone obtained in (2) in ml. of dioxane, is added over a period of 20 minutes to a freshly prepared solution of 4.0 -g. of silver oxide, 3.0 g. of sodium thiosulfate and 5.0 g. of sodium carbonate in 150 ml. distilled water. The temperature of the reaction mixture is maintained at 50-60 during the addition and for an additional hour. At this point, the mixture is brought to a temperature of 95 for /2 hour. The mixture is then filtered and the filtrate is diluted with 200 ml. of water, acidified with dilute nitric acid and extracted with chloroform (3 x200 ml.). The combined chloroform extract is Washed with 50 ml. of Water and dried over sodium sulfate. The chloroform is then removed and the residue extracted with boiling water (2X ml). Concentration of the water solution, followed by cooling, precipitates the 6-methoxy-2-nitrophenyl acetic acid.

(4) Ethyl-d-mefltoxy-Q-rvitrophenylacetyl mal0nate.- The product from A(3) is used in the procedure of part A(1) to give the corresponding acid chloride. A solution (0.02 mole) of this compound in 25 ml. of ether is gradually added to a refluxing ether solution of ethyl ethoxyrnagnesiomalonate. Heating is continued until stirring is difficult due to formation of a viscous oil. The cooled mixture is then shaken with dilute H 50 (2.5 g. in 20 ml. H O) until the oily magnesium complex has dissolved. The ethereal phase is separated, washed with water, and dried over Na SO Evaporation yields the crude ethyl- 6-methoxy-2-nitro-phenylacetylmalonate.

(5) fi-methoxy-2-nitr0phenylacet0ne.-A solution of 5.7 g. of the product from A(4), 12 ml. of acetic acid,

2? 1.5 ml. of sulfuric acid and 8 ml. of water is refluxed for 6 hours. The cooled solution is made alkaline with 5 N sodium hydroxide and extracted with ether (3X50 ml.). The combined ethereal extract is washed with water, dried over sodium sulfate and evaporated to give an oil which rapidly solidifies. Crystallization of this solid from ethanol yields 6-methoxy-2-nitrophenylacetone.

(6) 4-meth0xy-2-methylindole.l.2 gm. of the product from A(5) is added to a mixture of 100 ml. of ethyl alcohol and 1.0 g. of Raney nickel. This solution is shaken at room temperature and atmospheric pressure, in hydrogen for /2 hour. The solution is then filtered and the filtrate evaporated under reduced pressure. Crystallization from light petroleum ether yields 4-methoxy-2- methylindole.

(B) 2-methyl-4-meth0xy-3-ind0lylaceiic acid.When 4-rnethoxy-2-methylindole is used in place of 5,7-dimethoxyindole as described in Examples 47A, 47B and 47C, there is o'btained 2-methyl-4-methoxy-3-indolylacetic acid.

(C) [1-(pyrimidinyl-S-carbonyl)-2-methyl-4-meth0xy- 3-indolyl1acetic acid.When the product from 51B is used in place of 6-methoxy-3-indolylacetic acid as described in Examples 46A, 46B, 46C and 46D, there is obtained [1 (pyrimidinyl S-carbonyl)-2-methyl-4-methoxy-3-indolyl] acetic acid.

EXAMPLE 52 [1-(pyrimidinyl-S-carbonyl) -7-melh0xy-5-methyl-3- indolyl] acetic acid (A) 7-meth0xy-5-methylind0le.--0.1 mole of 4-methylo-ansidine is added to 0.1 mole of monochloroacetaldehyde and the mixture refluxed for 2 hours. The water formed is distilled off and the residue is heated at 210- 220 for an additional hour. This residue is then chromatographed on acid-washed alumina and eluted with etherzpetroleum ether. The eluent is removed under reduced pressure and 7-methoxy-5-methylindole is obtained.

(B) [I-(pyrimidinyl-S-carbonyl)-7-meth0xy-5-methyl- 3-ind0lyl1acetic acid-The product from part A is used in the procedures of Examples 46A, 46B, 46C and 46D. There is obtained [1 (pyrimidinyl-S-carbonyl)-7-methoxy-5-methyl-3-indolyl]acetic acid.

(C) [I-(pyrimidinyl 5-carb0nyl) 5 -flur0-meth0xy- 3-indolyl1aceiic acid.The procedures of parts A and B are followed, starting with 4-fluoro-o-anisidine, to give [1 (pyrimidine carbonyl)-5-fluoro-7-methoxy-3- indolyl]acetic acid.

(D) [1 (pyrimidinyl-5-carb0nyl)-5-nitr0-7-methoxy- 3-indolyl1actic acid.-The procedure of parts A and B are followed starting with 4-nitro-o-anisidine, to give 1- nicotinoyl-5-nitro-7-methoxy-3-indolylacetic acid. When this is used in the procedure of Example 15, there is produced [1-(pyrimidinyl-5-carbonyl -5-dimethylamino- 7-methoxy-3-indolyl] acetic acid.

EXAMPLE 53 [1- (pyrimidinyl-5-carb0nyl) -2-allyl-5-meth0xy-3- irzdolyl] acetic acid (A) S-methoxy-Z-indolyl acetaldehyde.A solution of 5-methoxy-2-indolylacetyl chloride (0.1 mole) in dry tetrahydrofuran is treated with 0.25 mole of lithium aluminum tri-t-butoxy hydride with ice-cooling and stirring. After the initial reaction, the mixture is stirred at room temperature for 4 hours and poured into ice. Excess of acetic acid is added and the product is extracted with ether. The ethereal solution is washed with sodium bicarbonate, dried over sodium sulfate and evaporated to a syrup. Chromatography of the residue on a column of silica gel, using ether-petroleum ether (v./v.) 1030% as eluent, gives 5-methoxy-2-indolyl acetaldehyde.

(B) 2-allyl-5-meth0xyindole-A solution of 0.1 mole of the aldehyde and 0.12 mole of methylene triphenyl- 28 phosphine, prepared in situ from 0.12 mole of methyl triphenylphosphonium iodide and 0.12 mole of n-butyl lithium, in benzene is stirred at room temperature for 4 hours and then at for one hour. The solution is washed with 0.5 N hydrochloric acid, water and dried over sodium sulfate. Evaporation of the solvent in vacuo and chromatography of the residue on a column of 300 g. acid-washed alumina, using ether-petroleum ether (v./v.) 020% as eluent, gives 2-allyl-5-methoxyindo'le.

(C) Z-allyI-S-methoxygramine.A solution of 0.032 mole of 2-allyl-5-methoxy indole in 40 ml. of dioxane' is added dropwise, over 30 minutes, to an ice-cooled stirred mixture of 40 ml. dioxane, 40 ml. acetic acid, 3.2 ml. 36% aqueous formaldehyde and 8.8 ml. 25% aqueous dimethylamine. The clear solution is stirred and cooled for two hours and then allowed to warm to room temperature overnight. To this solution is added 500 ml. of water. The turbid mixture is then treated with charcoal and filtered through a silicaceous filter aid. The clear filtrate is made alkaline with 400 ml. of dilute NaOH solution and cooled in a refrigerator. The mixture is filtered and the solid gramine is washed with water and dried.

(D) 2-allyl-5-meth0xy 3 indolyl act0nz'trile.-0.l06 mole of the gramine from part C is added to 420 ml. of methyliodide, with vigorous stirring, over a period of 20 minutes. The reaction mixture is then allowed to remain at 5 for 15 hours. The solution is filtered and the iodine metholate cake is dried at 50 C. The solid is dissolved in a solution of 60 g. NaCN in one liter and warmed for 2 hours at 80. The desired product is extracted with chloroform which is then evaporated to give a crude oily product. The oil is then dissolved in 250 ml. of ether, filtered and the filtrate is concentrated. The concentrate is diluted with petroleum ether, at which point the 2-allyl-5-methoxy-3-indoly1 acetonitrile precipitates. The mixture is filtered and the cake dried.

(E) Z-allyl-S-methoxy 3 indolylacctic acid.-0.08 mole of 2-allyl-5-methoxy-3-indolyl acetonitrile is added to a mixture of 140 ml. of alcohol, ml. of water and 4.3 g. of KOH. The mixture is refluxed 15 hours and then brought to room temperature. Glacial acetic acid (60 ml.) is added and the solution is filtered through a tale filter. The filtrate is diluted with 500 ml. of water and the precipitated 2-al1yl-5-methoxy-3-indolylacetic acid is separated by filtration and dried.

(F) [1 (pyrimidinyl 5 carbonyl) 2 allyl 5- methoxy-3-indolyl]acetic acid.The procedure of Examples 47A, 47B, 47C and 47D is followed using the product of part B in place of the 6-methoxy-3-indolylacetic acid, to produce [1-(pyrimidinyl-S-carbopyl)-2- allyl-5-methoxy-3-indolyl] acetic acid. j"

EXAMPLE 5 4 [1 (Z-methyl-5-amin0pyrimidyl-4-carb0nyl) 2-methyl- 5-meth0xy-3-indolyl]acetic acid (A) 2-mefhyl-4-cyanoi-5-nitmpyrimidine.-A mixture of 0.1 mole of 2-methyl-4-chloro-S-nitropyrimidine, 0.15 mole of sodium cyanide and 300 ml. of dimethylsulfoxide is heated to 80-400 C. for 8 hours. The mixture is cooled and diluted with two liters of water. It is then extracted twice with 200* cc. portions of ether and the (C) [I (2 methyl 5 nitropyrimidyl 4 carbonyl)- 2 methyl 5 methovcy 3 indolyl1acetic acicL-The product of part B is used in the procedure of Example 3A to produce p-nitrophenyl-Z-methyl-S-nitropyrimidyl carboxylate. This is then used in the procedures of Examples 50 and 5D to produce [1-(Z-methyl-5-nitropyrimidyl-4- carbonyl) 2 methyl 5 methoxy 3 indolylJacetic acid.

(D) [1 (2 methyl 5 aminopyrimidyl 4 carboxy) 2 methyl 5 methcy-3-z'ndolyl]acetic acid. The procedure of Example 11 is followed, using the product of part C in place of the indolyl ester used therein. The product is [l-(2-methyl-5-amin0pyrimidyl-4 carboxy) -2-methyl-5 -methoxy-3-indo1yl] acetic acid.

(E) [1 (2 methyl acetaminvpyrimidyl 4 car bonyl) 2 methyl 5 methoxy-3-ind0lyl]acetate-The procedure of Example 16 is followed, omitting the final bicarbonate wash, using the product of part C of this example. There is thus obtained [1-(2-methyl-5-acetaminopyrimidyl 4 carbonyl) 2 methyl 5 methoxy- 3-indolyl] acetate.

EXAMPLE 55 Methyl[1 --(2 trifluoromethyl 4 dimethylamimopy- (A) 2 trifluo romethyl 4 dimethylaminopyrimidine- S-carboxylic acid.-A mixture of 2-trifluoromethyl-4- chloropyrimidine-S-carboxylic acid and a large excess of dimethylarnine is heated to 100 in an autoclave for 4 hours. The dimethylamine is then evaporated and the residue is dissolved in a minimum amount of water. The pH is adjusted to about 6.5, with acetic acid and the mixture is diluted with ethanol. The precipitated 2-trifluoromethyl 4 dimethylaminopyrimidine 5 carboxylic acid is filtered and dried.

(B) Methyl[1 (2 trifluorom'ethyl 4 dimethylaminiopyrimidyl 5 carbonyl) -2-m:ethyl-5-methoxy-3-indolyl]acetate.'I'he procedure of Example 3 is followed, using the product of part A, to produce methyl[l-(2-trifluoromethyl 4 dimethylaminopyrimidyl 5 carbonyl)- 2-methyl-5-methoxy-3 -indolyl] acetate.

EXAMPLE 56 Methyl [1-(2-trifluoromethyl-4mercaptopyrimidine-5- carboxy-Z-methy l-5-meth0xy-3-ind'0ly l] acetate (A) 2 trifluoro methyl 4 benzylthiopyrimidine 5- carboxylic acid.-The procedures of Examples 20A, 20B, 20C are followed using benzylmercaptan in place of benzyl alcohol in the procedure of Example 203 to produce 2- trifluoromethyl 4 benzylthiopyrimidine 5 carboxylic acid.

(-B) Methyl[1 (2 trifluoromethyl 4 benzylthiopyrimidine 5 carboxy) 2 methyl 5 methoxy 3- indolyl]acetate.The procedure of Example 20D is followed using the product of part A to produce methyl[1- (2 trifiuoromethyl 4 benzylthiopyrimidine 5 carboxyl) -2-methyl-5-methoxy-3-indolyl] acetate.

(C) Methyl[1 (2 trifluoromethyl 4 mercaptopyrimz'dine 5 carboxy) 2 methyl 5 methoxy 3 indolyl]acetate.The procedure of Example 20B is followed using the product of part B to produce methyl[1- (2 trifluoromethyl 4 mercaptopyrimidine 5 carboxy) -2-methyl-5 -methoxy-3 -indolyl] acetate.

(D) Methy lfl (2 mercwpto 4 hydro-xypyrimidine- 5 carboxy) 2 methyl 5 melhoxy 3 ina0lyl1acetate.-When the procedure of Examples 20A, 20B, 20C, 20D and 20E are followed, using as the starting azine acid 2 benzylthio 4 chloropyrimidine 5 carboxylic acid, there is obtained methyl[1-(2-rnercapto-4-hydroxypyrirnidine 5 carboxy) 2 methyl 5 methoxy 3 indolyl] acetate.

30 I claim: 1. A compound of the formula:

1 b oH-ooM N/ RI R4 i R1 in which R is selected from the group consisting of pyrimidinyl, pyridazinyl, pyrazinyl and substituted pyrimidinyl wherein said substituent is selected from the group consisting of halo, lower alkyl, phenyl, lower alkylthio, lower alkoxy, trifluoromethyl, lower alkyl sulfonyl, benzylthio, phenoxy, nitro, morpholino lower alkyl and substituted pyrazinyl wherein said substituent is selected from the group consisting of lower alkanoyl amino; halo, lower alkyl, carbonyl, benzamido and substituted pyridazinyl wherein said substituent is selected from the group consisting of halo and lower alkoxy phenyl;

R is selected from the group consisting of hydrogen,

lower alkenyl and lower alkyl;

R is selected from the group consisting of hydrogen,

and lower alkyl;

R is selected from the group consisting of hydrogen, lower alkyl, lower alkoxy, fluorine and trifluoromethyl and is on a position selected from the group consisting of the 4 to 7 positions;

R is selected fromthe group consisting of hydrogen, hydroxy, lower alkyl, lower alkoxy, nitro, amino, di(lower alkyl)amino, l lower alkanoylamino, bis-(hydroxy lower alkyl)amino, l-pyrrolidino, 4-methyl-1-piperazinyl, 4-morpholinyl, cyano, amino lower alkyl, di(lower alkyl)amino lower alkyl, trifluoromethyl, halogen, di- (lower alkyl) sulfamyl, benzylthio, benzyloxy, lower alkylbenzyloxy, lower alkoxybenzyloxy, halogenobenzyloxy, lower alkenyl, lower alkenyloxy, l-azacyclopropyl, eyclopropylmethyloxy and butylmethyloxy; and

M is selected from the group consisting of OH, NH benzyloxy, lower alkoxy, OZ where Z is selected from the group consisting of alkali metals, aluminum, magnesium and iron, and CY where Y represents the structure 2. A compound of the formula:

CHzCOMl in which R is selected from the group consisting of pyrazinyl, py-

ridazinyl and pyrimidinyl;

R is lower alkyl;

R is lower alkoxy; and

M is selected from the group consisting of hydroxy and lower alkoxy.

31 3. A compound of the formula:

R is selected from the group consisting of pyrazinyl, 4-

pyridazinyl and 5-pyrimidinyl; R is methyl; R is methoxy; and 5 Mis methyl.

No references cited.

NICHOLAS S. RIZZO, Primary Examiner. 

1. A COMPOUND OF THE FORMULA: 